Non-existing account service

I have been having endless problems in obtaining an account for a procedure I had done on the 05.05.2020. I have phoned many, many times and have been told that their computer systems were hacked, they were behind in their accounts, or they simply did not answer the phone. I requested to speak to the head of the accounts department, but the phone went through to the message system. I am frustrated at the level of service and would not even have given a one star rating.