NIGHTMARE IN TRYING TO CANCEL A CONTRACT WITH TELKOM

What a nightmare to cancel a contract! I was notified by e-mail that my contract is expiring. I have been trying to cancel the contract for 3 (three) months now. I had the multi-sim data contract. They cancel the additional sim of R9,00 per month but the main contract remain in full force and the costs are just mounting. The first very ****y consultant just put the phone down, the second one cancelled the additional sim-card but not the main contract. I have such a battle to get this cancelled and have to reverse the debit order every month. How can one resolve this?