Bad service will cost my husband his life

I have been blacklisted for an account with MTN - which I have never had!!!! At the MTN store in Port Alfred - my ID number does not come up - PROVING THAT I HAVE NEVER BEEN A CUSTOMER. When I call customer services they are decidedly unhelpful. They cannot tell me what I owe or why. They have no paperwork for me on the system. I first heard about this via an SMS. No accounts were ever sent as there is no account or proof that I owe any money. MTN has had me blacklisted on ITC and now I cannot get credit ANYWHERE. I have always paid my bills and this is TOTALLY unfair. My husband has cancer and I need to raise funds for his treatment. This mess caused by MTN, may cost him his life. I have been in contact with MTN on numerous occasions. I was told to write an affidavit and email it. I have done this and was assured that a case of ***** has been opened. But absolutely nothing has been done since then February 2021!!