Did not cancel my contract

I took out a contract at Telkom the Glen branch, on the 7th day I cancelled the contract every month there after monies were taken out of my account which was in excess of R10 000.00. I went back to the branch to quiery this but the store manager after I explained to him what happened denied responsibility for what happened and advised me to go to my bank to resolve the matter. the following month monies where again taken out of my account, I went back to the store and the manager (Frances Matebo) refused to see me. I went from floor manager to floor manager I was then in contact with the regional manager Anistasia Styn personal assistant. I sent her an email explaining what had happened she to date has not gotten back to me. Ive sent an email to the head of legal and even they haven't gotten back to me. Is been more than 3 weeks and they are pretending that this didnt happen