Remove the "this membership level is free" language from PMPro member change emails. Any recurring subscription will still be deleted (unless you are doing something else), but that language was confusing in some cases. Add this to a custom plugin or your active theme's functions.php.

nofree_pmpro_email_data.php

/*
	Remove the "This membership is free" text from membership change emails.
*/
function nofree_pmpro_email_data($email_data, $email) 
{
	if(!empty($email_data['membership_change']))
		$email_data["membership_change"] = str_replace(". This membership is free", "", $email_data["membership_change"]);
	
	return $email_data;
}
add_filter('pmpro_email_data', 'nofree_pmpro_email_data', 10, 2);