Way / Tool to test the web page that seems like web service endpoint

I am working on a project where the client provided the below URL as their endpoint and a sample payload, which I tried to run with SOAP UI and POST MAN without any luck.

My question is how can I test the webapp like this using the tools available in the market.

https://50.100.150.200:4444/TestService.aspx?MsgId=TestMessage&CompanyCode=250

<?xml version = '1.0' encoding = 'UTF-8'?>
<TestReq>
    <CompanyName>TestCompany</CompanyName>
    <CompanyAddress1>Street1</CompanyAddress1>
    <CompanyAddress2>Street2</CompanyAddress2>
    <CompanyCity>SampleCity</CompanyCity>
</TestReq>