Termination of an already expired Telkom contract, a nightmare!

My Telkom contract expired over a year ago and I had declined to renew it again as I needed uncapped fibre internet,Telkom could not offer me that service because they were not covering my area. I called Telkom several times about my wish to terminate the service but I was told to do the cancellation on their website but that process is extremely worthless. I found it very difficult to cancel my expired contract now I don't know what to do as Telkom is still continuing to make debits on my account and I now with MWEB and find myself having to pay for 2 internet services one which is absolutely worthless and unnecessary