Horrible experience

I am currently under debt review and arrangements have being made to pay my ABSA credit card via debt busters. ABSA then decides to cancel the arrangements and hold me resposible as they claim they were short paid by a few rands and debt busters reconciled and said they payments were in advance. This is another horrible experience im having with ABSA. Legally this should not be my responsibility as I have not defaulted but ABSA accuses me of defaulting and have no real reason for not making a new arrangement with debt busters. I would this resolved and make a new payment arrangement with debt busters or will be contacting my lawyers.