Look at the server response for the URL from your question:
https://integrations.trxglobal.com/RatingService.svc?wsdl:
Configuration binding extension 'system.serviceModel/bindings/wsHttpsBinding'
could not be found. Verify that this binding extension is properly registered in system.serviceModel/extensions/bindingExtensions
and that it is spelled correctly.
You have a configuration error on your server which you will need to fix.
(You also need to turn on custom errors to avoid exposing such detailed information to the whole world.)