Telkom public ******s

I did have an contract with Telkom which expired two years ago, agonizingly they just debit my bank account as an when they want to with any amount that they can think off. It frustrating me as I am constantly reversing that and spending fees in any of those transactions. Now Telkom is damaging my credit record by making as if I have signed a lifetime contract with them. I believe they should refund me all my monies paid for fees paid when the reversal was made until recent month where they did the same within a week after reversing their nonsensical behavior.