Poor service

I terminated my contract on the 28th Feb 2015 with the ref no: ***9 at Maponya mall and i was told that the contract would be cancelled, to my suprise the contract is still active and they are still billing me. I went back to the store (Maponya mall) to query this and a new ref no: ***3 was given to me on the 09th of May 2015, I was told a consultant would call me to confirm the termination but I'm still waiting till now. I called the call centre i was given the same story. I'm not happy with the service I'm getting and i get billed for a contract that i terminated, how long does one have to wait for a contract to be terminated?