Incorrect billing coupled with horrific service

MetroFibre upgraded my account without my consent. I picked this up two months ago on the monthly invoice they sent me. I brought this oversight to their attention and to date no one has bothered to assist me despite my numerous calls. This morning I called them again and they lady who assisted me confirmed that this was a request from another client with the same surname as mine and incorrectly upgraded my account in error. I requested her to provide me with a correct invoice immediately and she decided to hang up - I have constantly been a victim of this terrible service from the team at MetroFibre and have been patient with them but today was just the last straw!!!