Expire membership access on last billing date

    add_action( "pmpro_after_change_membership_level", "e20r_cancel_at_end_of_period", 10, 2 );
    add_filter( "pmpro_email_body", "e20r_email_body_for_cancel_msg", 10, 2 );

    /**
     * Change cancellation to set expiration date for next payment instead of cancelling immediately.
     * Assumes monthly membership levels.
     * Assumes orders are generated for each payment (i.e. your webhooks/etc are setup correctly).
     *
     * @param (int) $level_id -- The membership levelId we're changing
     * @param (int) $user_id -- The member we're changing levels for.
     */
    function e20r_cancel_at_end_of_period( $level_id, $user_id ) {

        global $pmpro_pages, $wpdb;

        // Make sure we're on the 'cancel' page (for PMPro).

        if ( is_page( $pmpro_pages['cancel'] ) ) {

            /*
             *   okay, let's give the user his old level back with an expiration based on his subscription date
             */

            /* Fetch the last order */
            $order = new MemberOrder();
            $order->getLastMemberOrder( $user_id, "cancelled" );

            // Fetch the levelId representing their most recent (old) membership level.
            $level = $wpdb->get_row( $wpdb->prepare("
                          SELECT *
                          FROM {$wpdb->pmpro_memberships_users}
                            WHERE membership_id = %d AND user_id = %d
                            ORDER BY id DESC
                            LIMIT 1
                        ",
                    $order->membership_id,
                    $user_id )
            );

            // Not allowed to do this unless there's both a levelId and an order located in the system
            // This is probably wrong since $order rarely (never?) is empty.
            if ( ( ! isset( $order->user_id ) ) || empty( $level ) ) {
                return false;
            }

            if ( empty( $level->cylcle_number ) ) {
                return false;
            }

            // Calculate the "last payment date" (using "today").
            $lastdate = date("Y-m-d", $order->timestamp);

            //Calculating the "next scheduled date"
            $nextdate = $wpdb->get_var( $wpdb->prepare("
                            SELECT UNIX_TIMESTAMP(%s + INTERVAL %d {$level->cycle_period})
                        ",
                    $lastdate,
                    $level->cycle_number
                )
            );

            //if the date in the future?
            if ( $nextdate - current_time('timestamp') > 0 ) {

                // Set their level to the one they're currently at, but leave the expiration date set to their next billing date.
                $sql = $wpdb->prepare("
                        SELECT *
                          FROM $wpdb->pmpro_memberships_users
                          WHERE ( membership_id = %d ) AND ( user_id = %d )
                          ORDER BY id
                          DESC LIMIT 1
                    ",
                    $order->membership_id,
                    $user_id
                );

                $old_level = $wpdb->get_row( $sql, ARRAY_A );

                $old_level['enddate'] = date( "Y-m-d H:i:s", $nextdate );

                //disable this hook so we don't loop
                remove_action( "pmpro_after_change_membership_level", "e20r_cancel_at_end_of_period", 10, 2 );
                remove_action( "pmpro_after_change_membership_level", "e20r_membership_level_config", 10, 2 );
                remove_action( "pmpro_after_change_membership_level", "e20r_clear_upcoming_appointments", 11, 2 );
                remove_action( "pmpro_after_change_membership_level", "e20r_after_change_membership_level", 10, 2);
                
                //change level
                pmpro_changeMembershipLevel( $old_level, $user_id );

                //add the action back just in case
                add_action( "pmpro_after_change_membership_level", "e20r_cancel_at_end_of_period", 10, 2 );
                add_action( "pmpro_after_change_membership_level", "e20r_membership_level_config", 10, 2 );
                add_action( "pmpro_after_change_membership_level", "e20r_clear_upcoming_appointments", 11, 2 );
                add_action( "pmpro_after_change_membership_level", "e20r_after_change_membership_level", 10, 2);

                //change message shown on cancel page
                add_filter( "gettext", "e20r_gettext_cancel_text", 10, 3 );
            }
        }
    }

    /**
     * @param $translated_text -- Text to replace/update
     * @param $text -- The text
     * @param $domain
     *
     * @return string
     */
    function  e20r_gettext_cancel_text( $translated_text, $text, $domain ) {

        if ( ( $domain == "pmpro" ) &&
            ( $text == "Your membership has been cancelled." ) ) {

            global $current_user;

            $translated_text = "Your membership has been cancelled. Your access to schedule and join new sessions will expire on " .
                date_i18n( get_option( "date_format" ), pmpro_next_payment( $current_user->ID, "cancelled" ) ) .
                ", but you may schedule new sessions until then. Once your membership expires, any scheduled sessions " .
                "will be removed automatically.";
        }

        return $translated_text;
    }

    /**
     * If the user cancels, send a message about when the cancellation will actually occur.
     *
     * @param (string) $body - The content of the message (we'll append the cancellation date to it)
     * @param (object) $email -- The email object.
     *
     * @return string -- The new body of the email message.
     */
    function e20r_email_body_for_cancel_msg( $body, $email ) {

        if ( $email->template == "cancel" ) {

            global $wpdb;

            $user_id = $wpdb->get_var("
                      SELECT ID
                      FROM $wpdb->users
                      WHERE user_email = '" . esc_sql( $email->email ) . "' LIMIT 1"
            );

            if( ! empty( $user_id ) ) {

                $expiration_date = pmpro_next_payment( $user_id );

                // Only update the body of the message if the date is in the future.
                if ( $expiration_date - current_time('timestamp') > 0 ) {

                    $body .= "<p>Your access will expire on " . date( get_option( "date_format" ), $expiration_date ) . ".</p>";
                }
            }
        }

        return $body;
    }

I have added this code in theme functions but not working at all, any suggestions ??
PMP - 1.8.6.7
WP - 4.4.1