Still being billed for a cancelled contract

I had a month-to-month with Telkom (clearly states 30 days notice for cancellation on the contract) for a good couple of years. We moved into a place that had free wifi so I gave notice for cancellation of the 28th July 2015. I went through the correct channels, completed the cancellation form in and took it in store to Tyger Valley. I got treated with very bad attitude and service but eventually I signed to cancel the contract. Or so I thought. I got billed for the next two months for the contract, after the second debit order ran I went in store to query it. All that they could do was to \escalate the query"and make sure that it had been cancelled. They assured me that it had been and that another debit order WOULD NOT come off. After the next one came off I went back in and they said they couldnt help me and i had to call the call centre. After 8 attempts at getting assistance from the call centre staff i took to FaceBook to try get an answer. I have been trying to resolve this query for over 4 months now and i am still getting billed and no one at Telkom can assist. I have no idea when or how this is going to be resolved but Telkom clearly doesnt care!"""