Blue Bean Credit Card vs NDS credit management

I owed a Standard Bank Blue bean Credit Card which due to unforeseen circumstances I could not pay. My account then was handed over to NDS Credit Management. I have been paying the account on a debit order or R1000 for the past 20 month. Currently i paid R20000. I requested statement from NDS and i recieved 3 different statement with differerent charges. I recently asked if i can settle the account and i was told i'm still owning an amount of almost R6000. When i phone NDS they cant explain the charges of R6000 and blame Blue bean. Blue Bean denied charging me more extras after my account has been handed over. I already lost lots of money calling the two institution and no one seems to want to help me. Can you please assist because i were supposed to be paying less than R2000 rand to settle which are the charges of the Credit management of when my account handed over..