Telkom mobile wont terminate my contract!

My Telkom contract on my Iphone5 was supposed to have ended 3 months ago, My monthly installment varied between R390 and R600. I went to one of the Telkom mobile stores at Cape town, Adderley street and filled in forms to terminate the contract and have my number converted to prepaid. My request has since never been attended to! <br> <br> I called several times, even went to the store to enquire and got no help. Meanwhile my account is being debited with almost R300 of data and SMSs I do not want to pay for at Telkom anymore. Everytime I call their excuse is that they never find me, which is not true. The only calls I have received have always been from Telkom people wanting to sell me a new contract (i.e. \upgrade my account")"