canceling a contract

I have an Internet contact with 8ta and I cancelled it More than 6 months ago as the contract was finished and their reception in brackenfell s?cks. I went to the store 6 months ago to cancel my contract, a month later when they again debited me I phoned the call centre. I was told all was fine and it was cancelled. Yet again this morning I saw I was debited again. Telkom what do I need to do to get the contract cancelled? And please update your system so that cell phone and internet actually work here in Brackenfell (Sonkring).