SOAP Integration Error for SMS

I am trying to integrate SMSGlobal for sending SMS using SOAP but getting 404 error. I have tried using custom template request as well but still not working. Its giving this error: Caused by: com.ctc.wstx.exc.WstxParsingException: Illegal processing instruction target ("xml"); xml (case insensitive) is reserved by the specs. any idea how to see actual error or suggestion to resolve it? SMSGLobal SDK:   REST integration needs custom header so unless I write JavaAction, i don't see any other way to integration. 
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