Shady airfare bookings

This company booking airline passage is not trustworthy. I paid eventually about R900 more for a domestic flight than I would hav epaid had I booked directly with the Aitline. An now they keep on deducting R1299 for I dont now what as I never agreed to pay an additional fee. When you call them their standard asnwer is that they do not refund payments. I reported this unauthorised deduction from my bank account and they suggested that it might be a *****ulant claim on my account. Please don't use this agency as I feel that they are not to be appointed as a flight booking agent.