Continual Billing after Cancellation

I cancelled my account via the 2 email addresses that the telkom store told me to send to ( apparently I can't cancel in store ) in March.

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In July I was still getting billed and not using the service.

I have tried with the contact center, but after huge waiting times I get told they can't help.

I had to cancel the debit order at the bank. But Telkom still bills me every month and it's adding up. Now I'm getting calls from companies wanting the money but on explanation to them, they say they can't do anything, they are just collecting money!

How hard is it to cancel an account.