Billing After Contract Expired

I am Mr Mlambo S.M. It happened for me to have a contract with Cell C for 24 months and the contract ended or expired in June 2012.I did not upgrade then to my suprise from June 2012 till now your company is still deducting R145 in my bank account and I tried to discuss the matter with you but I was not helped to rectify this billing mistake.All I want from you is to cancel this wrong billing ffrom my account and reburse me with all my monies that you have deducted from July 2012 till now even ur simcard is no longer in used because of this frustration that you have put me through.Please rectify this error on your side and payback my monies as soon as possible because some day I will real like to do business with you and even recommend other people to do business with you.