Impossible to get rid of Telkom contract

I had a month to month Telkom Lte account, when I could not afford the service anymore, I phoned and canceled the service, however a month later the service was not yet canceled, the next month I then reversed the debit order and my service was suspended. However Telkom still kept charging me every month for a service i did not receive. now i have been handed over! how is this legal if i had a month to month contract.