Pathetic Service From Cell C

I opened up a Cell C contract in 2014, i gave them my Absa bank account details. They debited my account as per usual and after 6 months my phone fell and broke. I then opened up a new cellular contract at Telkom Mobile. I thought that Cell C would continue to debit me for the contract which i took out. Two weeks ago i found out that i owe Cell C R4 500 for debit orders being returned and that my account has been handed over to their attorneys. I did my own investigation and found out that Cell C started to debit my Capitec bank account which had insufficient funds in it. I had never gave authorization to Cell C to debit my Capitec account. I am based in Cape Town and never left, there systems show that someone walked into Cell C in Sandton City Mall and changed my details. I don't know how this has happened. My credit rating has been negatively been impacted by this. The consultants are a waist of time, ive sent them my bank details and all relevant information but they still don't respond to me. This is the worse cellular service ever. I wouldn't recommend this service to anyone and they have illiterate call center operators. I will be opening up a case of ***** against Cell C