I feel really sorry for you. My only advice is to get out of it and cut your losses. A self funded course would be a heap cheaper. It is unfortunate that VET fees seem like a free loan but they aren’t. Clare summed it up pretty well.
The making of a good instructor is more dependent on the supervision they get when starting out than on the instructor rating course. That said, a good course is a great start. A crap course can be corrected by a patient and mentoring CFI.
Best of luck 🙃