Conned into approving DebiCheck with the knowledge that they can't assist!

Late April 2025 Mi-law was referred to me by a cell provider as I'm under debt review and they will assist as I wanted a new cell contract. I signed up with the understanding that they will assist in removing the debt review but they conned me to approve a DebiCheck for R750. On or around 25th or 26th April they call and advised that after doing an assessment they are unable to assist due the debt review. They confirmed that no fees were due and the debit order will be cancelled as they are not able to help me. The debit order was not presented on 30 April 2025. To my surprise this morning I noted that they have drawn R750 from my account. I am unable to stop or dispute it with my bank due the DebiCheck which means I am not able to cancel this debit and do not know for how long this debit will be presented to my account and for how long. I called and asked what they for them to charge me the fee as I was the one to tell them I'm under debt review. They confirmed that they will be able to assist but then a few days later came back and advised that they can't. So, they con you into approving a DebiCheck knowing that you can't reverse/dispute the debit order.