TELKOM IS TERRIBLE

My cellphone contact came to an end on the 15th of February. A debit order for both the 25th of January 2023 as well as February was paid (i made a manual payment for February. Telkom is still deducting debit orders from my account and now I am being sent final invoices for late payments and being billed for late fees. Bare in mind on the 1 March 2023 they also took another Debit order of R298.01. I have now paid a total of R896.01. I was not supposed to be billed the R298.01, I have had numerous issues with telkom, with them always over-debiting my account. Another debit order of R409.37 was taken on the 25th of March this month which I had to reverse. I do not want my credit score to be reflected negatively because of this and would like my contract to be cancelled with a paid up letter, ALL OF THE AGENTS IVE SPOKEN TO ARE USELESS THIS IS THE WORST SERVICE PROVIDER EVER!!