High Billing and Non cancellation and No Service

I was overcharged on my bill for October and November. I called Cell C call centre for assistiance in Novemeber and till today no one has offered any resolution. I have been over charged for my R98 contract to R1999 now, i refuse to pay for something that i dont owe. My contract had 2gig supply and once finished, it will block access to the internet. I requested for full investigation to be done and the sales call and NO ONE HAS ASSISTED ME AND YET YOU STILL DEBIT MY ACCOUNT. Nthabiseng Ndlovu called to enquire about the BILL NOT MY QUERY, so much for SERVICE, and i told her about my query, i sent her the statements and requested her to assist, its been two weeks now NOTHING! I will continue to reverse the amount as i requested for my contract to be cancelled months ago and yet its still BILLING. Do you guys not adhere to TCF and are you aware of the CPA legislature? I want this matter sorted today!!!!