The customer experience in momentum client call centre sucks on the voice prompt I was asked to enter my id number or client number so that I can request tax certificate and on numerous times the system kept on telling me that my details were invalid

The customer experience in momentum client call centre sucks on the voice prompt I was asked to enter my id number or client number so that I can request tax certificate and on numerous times the system kept on telling me that my details were invalid. As a result of this inefficiency I couldn’t obtain my tax certificate. It’s really frustrating and I don’t know if the quick and fast way of getting this resolved as emails might take several days before I get a response. Very disappointing