Telkom's failure to cancel contract (request sent 13 July 2018) - Still being charged

My service with Telkom was cancelled (13 July 2018) & still hasn't been processed (I'm still being charged). Ref. numbers: ********** 5, ********** 4 & ********** 0. I have gone to Telkom Canal Walk twice to rectify this, with no help (I was told that they couldn't help & I had to wait to be contacted by Telkom). I am more than willing to pay any penalties for the early termination of my contract, but was told at the Canal Walk store that I should wait for my final invoice. Please take note that I would like to be reimbursed for anything I was billed for after my penalty & after the date the contract should have been cancelled.