Still being billed 9 months after cancellation.

After a 9 month despite over the original terms of my laptop contract that i was advised ended in April 2019 the Telkom Team reverted and said no it ended in April 2020. I followed all rules and steps to cancelling the service 2 months prior to April 2019- and I was advised that the subscription had been cancelled. I had two cell phone accounts with Telkom which I cancelled within the time frame and recieved notification last year that they were cancelled and paid the final amounts. Now this year I am being billed for my subscription of the 1 gb Free Me bundle that was cancelled in APRIL 2020! How can I still be billed for a service that has been cancelled for 9 months? I reversed the order now I get a bill for double the amount and an unpaid fee... how can there be an unpaid fee for an account that is cancelled? Telkom now owes me 9 x R117.15 which equals R1054.34 which CANNOT be a credit as I no longer have any Telkom accounts nor will I ever have a telkom account again due to the lack of customer service they provide. Telkom *****s from you even if you follow their rules to the T! Had enough.