Remove your debit mandate on. My bank. Account

I wanted to do a telkom data with Dsl Telecom, when I. Received a contract I realized that is a contract. I wanted month to month plan not contract. I did not sign their contract but their debit mandate is still active in my bank account. The lady who was helping me promised to take it out but she didn't do as she promised.. Please remove your debit mandate on my bank since I didn't take your plan. The lady who. Wast assisting me me is Tessa Human