incorrectly billed for data not used

I have been charged almost R8000 for bandwidth on my cell phone which had a soft cap on. Although they said it can't be 100% guaranteed (all cellular companies can on prepaid services). They couldn't prove my usage as I made a claim and made an affidavit, that it was not me that used the data. They requested a URL account and the last was that it was a mistake. I stopped monthly payment as they blocked my account. Now they handed me over to their legal department. I am willing to continue payment if they communicate with me, my service is restored and they waive the monthly payment while this was under investigation and I was falsely accused. (This was in May 2015). Service brought from Autopage cellular in Galleria Amanzimtoti. They couldn't provide me an account or any other detail at this store on 2015/12/06 except that I was handed to their legal department. Mobile number under dispute ***.