Unhappy and frustrated customer

I have an issue with cell c that I have been trying to resolve without any head ways since the 1st of July, numerous phone calls and email. I took out a Sim only contract of R99. 00 but to my surprise R215. 00 is debited on my account. I have made several inquiries with two case numbers but till date nothing has been done to resolve my issue. Case number ref *** and ***.i gave them the date I took out the contract so that they can retrieve my recording 2021/03/10.