No response on cancellation of contract

During November 2013 a sales lady from Telkom phoned me, telling me that my 10 Gig contract will expire within a month or so (which was a lie). I believed her and took out another contract of 7.5 Gig. I end up paying for two contracts. On 2 October 2014 I cancelled the second contract (7.5 Gig) at the local Telkom branch and receive case number ***3. That was seven (7) months ago and nothing was done to cancel the second contract, although I phoned the accounts department every month for the past seven (7) months to ask them what is their problem. On 16 April 2015 I again went to my local Telkom store, and they send a remainder to the accounts department, marking it as urgent. They also give me another case number - ***8. What happened? - nothing, I again received a bill and the contract is still not cancelled!! Your account department is useless!!!<br> Don't bother answer me, I cannot believe you. I will take it up with the ombudsman or my lawyer.