bad service from call centre agents.

I don't know what to do anymore. I am unhappy and tired of explaining the same thing over and over again. I made a D/O arrangement with one of the call centre agents at capfin who booked almost everything wrong to my surprise on the date that the debit order has to go off not only 1 debit order went off but 3. I wrote my first complaint to the manager / supervisor who called me and explained that the agent is at fault. The manager the said i may reverse one of the payments as it was never arranged for. This month I receive an SMS before the date of my arrangement to say that I missed my ptp? Then on my pay what I arranged for gets deducted and yet I'm still receiving calls to be told by an agent that I made an arrangement with them and failed the terms of the arrangement. I explain that there was a mistake that was made by the 1st agent and if they could look at their statement it should show that the arrangements still stand as agreed with the manager. A day after another agent calls me to tell me the same thing and I then now have to explain the sane thing. Not only that I have to be the one paying for bank charges of debit orders that keep going off on days I did not arrange.