Telkom account

Took out a contract for a modem 2 years ago which ended December 2021. I advised them over the phone that I would like to cancel. They have continued to charge my account. When I go in store, they advise to cancel online, I have attempted this and it continues to say error, I have also requested (from the Telkom App) that they call me but have not received any feedback. I always paid my account via eft when recently the did a debit order in July 2022 for a large amount when I had already made payment. I have heard a few people having the same issue! Very unhappy and frustrated, will be changing to another month network provider.