UNKNOWING CONTRACT UNDER MY NAME

Someone has opened an account with Vodacom under my name, I have to reverse a debit order every month which creates a very bad record on my side. This contract is even showing on my credit report... I have sent all documents to their ***** department, when I call for a follow up, I am being transferred to the wrong department, I am calling using my OWN airtime for these customer reps that are not doing their job and speaking like they don't want to over the phone... I am definitely suing Vodacom for this... My credit reputation is being ruined and they are taking this matter lightly!!!!!!!