********** Contract issue

I am here again after 3 months and the ********** contract in my name seems to still be active. I have been trying to get this resolved since January 13th. I have done all that was required of me by the company but it seems the issue has not been resolved even after I have been previously informed it was. On January 13th to my surprise I was notified that a Cell C contract was opened in my name, this was not done by me and I immediately informed Cell C of this. They then requested that I send in an affidavit and a copy of my ID which I compiled with. A month later I was informed the matter was resolved and account has been closed. To my surprise again I have been receiving calls from Cell C that my account is in arrears and when I call back to enquire they tell me they still have record of this account which explains the reason I am getting calls about the account in arrears. I have brought up the issue with Cell C so many times I feel I am out of options as this is now also reflecting on my credit report as an account in arrears. I honestly do not know what else to do regarding this matter