Telkom continues to bill customers after service termination and contract expiry

Telkom continues to bill customers after they have cancelled their services and their contracts have expired... We had a Telkom contract for adsl that ended in November 2019. We also went to the branch to formally cancel all Telkom services- ie together with the telephone line- on 31 December 2019 since we are relocating. To our utter dismay they ran a debit order of R1500 at beginning of Feb 2020 that was promptly reversed by our bank because we had blocked Telkom debits (after seeing other people’s reviews). Today they sent us a bill of R1826.58, which we do not understand since we cancelled Telkom in Dec and no service was supposed to be active since then. Besides, our adsl contract ended in Nov also. We were also not in arrears prior to cancellation of the service. Very disappointing Telkom!