STANDARD BANK VEHICLE FINANCE IS ****MING ME LIVE!

I have been back and forth with Standard Bank Vehicle Finance since June, my "mistake" was to make a lump sump of R50k towards my car loan after that it was a mess. I called after 7 days to allocate it and I thought all was well. Come end of July, debit order did not go through because whoever I spoke to for the allocation decided to pause my payments till next year August without my permission. I don't know how many times I have called to fix my account, everyone "assisting" is just doing what they think needs to be done but when the debit order comes a different amount is debited, leaving me in a minus again. As it stands my account is in arrears, damaging my credit score badly. The worst part is their audicity to hand over my account to collections but I have been waiting for feedback since July. Did I manage the part where my balance still has not changed much even after paying a whole R50 000?! I don't even know what to do now! This whole thing is draining me!