apple pay day

Took out a Apple Fast Cash loan on 10/2007. I closed my checking account that was associated with this loan because they wouldn't make payment arrangements unless my account was in default. Once this happened they still wouldn't and turned my account over to collections. Before sending it to a collection agency they added on about 400 worth of fee's (extension/rollover fee's) I have been trying to get a debt validation letter from both Apple and the collection agency so far no luck. I filed a complaint with the BBB and AG in both my home state and the collection agency/Apple's states. Apple has been complete jerks they are saying that I am lying that they have attempted to contact me with no luck and that I have not bothered to contact them. Apple said that they wrote off my account on 1/4/2008 and they wrote off my balance as 300 instead of 937.00….They have no idea where I am coming up with the 937.00 amount and they claim I am making up the collection agency part as well. The collection agency has now sent me a letter stating they cant send me a debt validation letter since they have no account history but that they have requested it from Apple. The collection agency said that if they don’t hear back they will not contact me any further. Do I call the collection agency and forward my letter from apple about apple writing off my account not sure what to do? I live in MN not sure if you needed to know that or not. What should I do about this?