Home loan debickeck nightmare

I app**** for a home loan and was approved. I was using absa at the time. A lady from fnb called to advise of the better benefits if i switched to fnb which i did. I paid all attorneys costs on time and then came time to register and fnb has a dispute with the debicheck. I explained that i switched to their bank but still no joy. I sent the salary switch form and still no joy. I dont know what to do now because my salary now goes to fnb cheque account. My things are on hold because of the debicheck which i dont understand whh it cant be done internally since i bank with you now..you insist on using my absa cheque account meaning i will have to keep transfering money into that account for fnb to be satisfied. Please help because im frustrated now. I will be homeless soon because of this thing i dont understand.