Extremely Bad Service

I have been having problems with Cell C since end of July. Accounts opened in my name and added benefits put to my exciting accounts. Received feedback from Cell C that all is sorted. Last call on the 4th October from Nadine at Cell C social media. As per our telecom all accounts are up to date and all added benefits and contract closed / Cancelled. To my suprize I get a call on the 6th October to inform me my account is in arrears also being threatened that I will not get credit anywhere if I do not settle my account. I tried giving the gentlemen the reference number for the call with Nadine. He wanted to hear nothing and wanted proof that I paid the account only. On Sunday I see my account has been debited to the amount of R590. Not even sure what it is for. I am at my wits end. Call centre and customer care numbers is of no help. Will this ever end. My bank account now in overdraft.