Amazon Prime Subsciption - Telkom is *****ing my Money!

My Telkom Fibre contract came with a 3-month free Prime subscription. But after the 3 months they start billing you automatically each month. I CANNOT unsubscribe from the Prime subscription as I do not have a Telkom phone number or land line number, I only have fibre with them. It is IMPOSSIBLE to unsubscribe via the APP or Online. I have been at multiple Telkom stores and no one can help me.

It has been more than 6 months and Telkom have ****** more than R600.00 from me.

If they do not rectify this problem then they are a bunch of *******.