Telkom still billing 3 months after cancelled

I visited a store to cancel my landline service( contract ended) after numerous calls to cancel by phone only to be put on hold or rudely cut off. Received a reference no and taught all good this was on 22 October 2021. Was billed for Oct was ok with that , then billed in November . Was billed again in December which had the bank reverse then got a bill for January 2022 for double the amount. Tried calling and was told the service was not cancelled even though there is a reference no to this, the consultant that took my call was working from home with children making a noise in the background, so unprofessional said she cannot transfer the call but will put in a request for a supervisor to call back, 2 weeks later nothing. Made a online complaint of the problem still nothing. Think twice before using Telkom. I will do a bank reverse again in January, they will not take my money for a service i stop using in Oct.