Disfuntional telephone centre and management of homeloan account

I am frustrated with Absa Homeloans department. their telephone lines are always down and when you get through the call will be cut due to a bad telephone line from their end and their agents never call back. I have been having these communication issues with them for so long. Secondly, they have the incorrect details of mine on their systems and after several requests for them to amend them ,they still have not. The communication issues have caused a problem with my account as I had sent required documents to them and after several calls and after a year I managed to get through but this means my homeloan account was affected.I am so dissapointed in them that Im considering switching my homeloan to another bank after 5 years!!!