Taking advantage of Account holders

I had a Makro account, for a number of years now. About two years back I went through an extremely rough time, without running away from my commitments a made the decision to go under debt review. To fast forward to now my circumstances have changed for the best. So still not running away from my commitments I made the decision to settle my accounts, and one of them was my RCS-Makro account. Phoning in to the call centre they advised me that to settle the account will be R1737, I paid that amount into the bank account of Makro. For the past few day I can not get hold of anyone either on RCS or Makro side for a paid up letter, however the worst is still yet to come: I got hold of consumer friend who is dealing with debt review clients of major retailers and they advise me that to settle the Makro Account is only a bit more than R900, and the amount I paid was incorrect (The amount that was given to me from Makro themselves), and yet still I have not heard from Makro and still I cannot reach them or RCS. I feel totally disgusted that you take advantage of your clients like that especially given the fact that I stood by my word throughout the years and I kept on paying even-though at times it was very difficult. So please advise who can I speak to, to resolve this problem and refund me the extra amount I paid to settle the account?