Their service consultants treat clients like they are doing them a favour

Their service consultants treat clients like they are doing them a favour. They add 3 times of money on the account which would be handed over to them. I was owing an MTN account R2 467 and my MTN account was handed to SSDA, and they made me pay close to R7 000. And I have all the proof of payments. After settling an account, they don't want to give me a paid up letter. By the way, they treat customers, it shows they are well connected and that's why they got the MTN contract, and they don't have good credentials