Debiting settled account

I app**** for the removal of debt review with Bayport including settlement of the certain account. After 3months i settled their debt. They were debiting from my persal. After I settled my account with them we communicated. To my surprised they keep debiting from my persal. And they do not return my money into my current account. They are costing me a lot. Debiting R2975 every month from my persal. I called them last month to stop but they are still continuing. This disadvantage me a lot. Especially that i no longer have business with them. They decreased my monthly income and adding expenses over my payslip.