updateCustomerInfo API is not working

Shamim was supposed to review the updateCustomerInfo API, but he just informed me that it is not working and that it needs to be reviewed with you.

Kindly check what can be done from your side as well.

<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:ser="http://server.api.nep.mobinets.com/">
<soapenv:Header/>
<soapenv:Body>
<ns3:updateCustomerInfo xmlns:ns3="http://server.api.nep.mobinets.com/">
<subscriberNo>9999200</subscriberNo>
<fullName>Tester Milestone 2</fullName>
<address>Muscat MUSCAT null Flat:1, Way:1, Building:1 2746 130</address>
<contractNumber>116327935</contractNumber>
<firstContactNumber>99557108</firstContactNumber>
<secondContactNumber>null</secondContactNumber>
<customerId>1352328</customerId>
<customerGroup> </customerGroup>
<customerCategory>Fixed-Business - Small</customerCategory>
<accountNo>11632793</accountNo>
<postalCode>130</postalCode>
<postalArea>130</postalArea>
<billFname>null</billFname>
<billLname>null</billLname>
<custAddress1>2746</custAddress1>
<custAddress3>Flat:1, Way:1, Building:1</custAddress3>
<remark>null</remark>
<titleCj>null</titleCj>
<billMinit>null</billMinit>
<billTitle>null</billTitle>
<arTiltleCj>null</arTiltleCj>
<arBillFnameCj>null</arBillFnameCj>
<arBillMinitCj>null</arBillMinitCj>
<arBillTitleCj>null</arBillTitleCj>
<arBillLnameCj>null</arBillLnameCj>
<woNo>1509082019</woNo>
<customerContactNo1>99557108</customerContactNo1>
<customerContactNo2>null</customerContactNo2>
<customerEmail>ahmed.alabri@baitqanoon.com</customerEmail>
</ns3:updateCustomerInfo>
</soapenv:Body>
</soapenv:Envelope>