inability to cancel my contract after it has ended.

Telkom mobile has, not once, but twice failed to cancel my contract after it has ended. they keep billing you. i have contacted their call center and i would be asked to resent the cancellation form. the second time i was told that my complained has been lodged and i will be contacted within 72 hours, i was never contacted, instead i got an email saying my case has been closed. to my surprised i am billed for the month of November for a contract that was suppose to end in August. this is the reason i keep canceling my contract with Telkom mobile. i would rather keep all my accounts prepaid. i am fed up and can not wait for the last one to be cancelled which is due this month (November). i have contacted ICASA before and it took Telkom mobile Months to tend to my case. i can not handle such stress again. it has been a very long two years for me with Telkom mobile.