over sell and cancelation of contract

We received a call from a Telkom agent asking us to renew a current existing contract which is up for renewal which we took. Later it was clear that our existing contract did not expire and therefore was not up for renewal. After a continues few call with the call centres we eventually went to centurion branch and was informed that the case has to be investigated and a determination will be communicated to us. We were very happy to receive a case number and later a call to inform us that we indeed was a victim of \overselling"(the agent was Khusoto Dladla . We understood from the agent that we will be refunded with R700 which was deducted from our account and that a courier will pick up the hardware for the new contract. We eventually was only debited for the old contract and thought that although the refund did not realise that at least the contract was cancelled and we were again able to pay the rest of our monthly creditors as per normal. This month my account was debited with more than R3000 after we received confirmation that no further debits will be made. We received poor service and are expected to pay for Telkom's mistakes. I recommend not supporting Telkom at all"""