Unauthorized debit order

I have never been so frustrated in my whole entire life I just want to close fnb and move to another bank. Telkom have been debating my account unauthorized. I've logged a complaint against Telkom with ombudsman. My contract came to an end in Feb 2022 and I did not renew nor upgrade and I've requested for cancelation. But they still debit my account with R1077. I've tried to reverse this I've send several communications to fnb that the debit is unauthorized. I had to transfer my whole salary from Cheq to my savings Acc to avoid another debit from them, and they did attempt to debit. If this matter can't be resolve and refund my debit order you I don't have any choice but to move to another bank that will listen to my cry.