Unfair treatment by DMC after paying 37k

I am extremely disappointed with DMC. Last month I paid DMC R37,500 to settle one account - I have proof of payment and I did this in good faith to clear my name.

I have 2 other accounts that were originally with MBD. MBD gave me cash settlement offers of R13,500 and R4,000. I saved up for months to pay those exact amounts.

Those 2 accounts were then bought by DMC. When I contacted DMC ready to pay the R13,500 and R4,000 I had saved, DMC refused and is now demanding R22,000 and R6,000 for the same accounts. So after already paying R37,500 last month, you still want almost R10,000 more than MBD quoted me for the remaining accounts?

I WANT to pay and I HAVE the money for what MBD quoted, but I cannot afford the inflated amounts DMC is adding. I am trying to settle, not avoid payment.