Payment reversal refusal

I am currently under debt counselling and the company representing me is Pay Plan Solutions. In June I opened up a Flexi save account with Absa and instructed my employer to pay my salary into the new Flexi account. Unfortunately this does take some time and my salary was paid into my Absa cheque account and subsequently Absa took the funds to settle my overdraft, even after Pay Plan Solutions and Absa has come to an agreement that my payments will be made via them. Absa is refusing to reverse the full amount of R8556.31 even after coming to an agreement with Pay Plan Solutions. I have accounts to settle and Absa is holding up the process with their red tape. Truly pathetic service that Absa cannot even give me or Pay Plan an answer after a week.