Still being billed for contract cancelled in Novem

I informed Telkom of not wanting to re-new my contract 1 month prior to the contract expiring. 3 months later I found out I was still being billed for it. I called customer and re-sent the cancellation documents I was once again given a case number and was assured by the agent that the contract would be cancelled( this happened November 2015). This month I found out I am still being billed for the contract. What the hell is wrong with Telkom how many times must something be done for them to get it right. I now want Telkom to give me back my money in cash. I now feel that Telkom is a ************* and a dishonest business and I urge all that reads this you check your statements.