I can't update a marketing center's limits via the api.

updatecampaignlimitsforcustomer.xml

<soapenv:Envelope xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xmlns:xsd='http://www.w3.org/2001/XMLSchema' xmlns:soapenv='http://schemas.xmlsoap.org/soap/envelope/' xmlns:urn='urn:MarketingCenter' xmlns:soapenc='http://schemas.xmlsoap.org/soap/encoding/'>
   <soapenv:Header/>
   <soapenv:Body>
      <urn:Put soapenv:encodingStyle='http://schemas.xmlsoap.org/soap/encoding/'>
        <Authentication xsi:type='ns1:Authentication'>
            <Username xsi:type='xsd:string'>******</Username>
            <Password xsi:type='xsd:string'>*******</Password>
            <CustomerId xsi:type='xsd:int'>3301</CustomerId>
            <Level xsi:type='xsd:int'>1</Level>
            <Source xsi:type='xsd:string'>hostname: HOST</Source>
            <Options xsi:type='xsd:int'>0</Options>
         </Authentication>
         <Method xsi:type='xsd:string'>reseller.updatecampaignlimitsforcustomer</Method>
         <Arguments xsi:type='urn:ArrayOfKeyValuePairs' soapenc:arrayType='urn:KeyValuePair[]'>
		 <item>
           <Key xsi:type='xsd:string'>customer_id</Key>
           <Value xsi:type='xsd:string'>36293</Value>
	   	</item>		
		 <item>
           <Key xsi:type='xsd:string'>blast_limit</Key>
           <Value xsi:type='xsd:string'>33</Value>
	   	</item>
	   	 <item>
           <Key xsi:type='xsd:string'>keyword_limit</Key>
           <Value xsi:type='xsd:string'>33</Value>   	
         </Arguments>
      </urn:Put>
   </soapenv:Body>
</soapenv:Envelope>