First of all, if you are in active foreclosure, you have the right to discovery of documents - even if you requested them pursuant to a QWR and even if you are in a receivership. To the extent that they cannot produce them, it may create a defense to the foreclosure. If they cannot foreclose, they may be much more willing to modify. It sounds like you are being bulled by the Bank - just because they CAN. Look at your legal defenses to the foreclosure and see about protecting your rights.
Secondly, if the bank is not responding to your QWR, you might consider writing a complaint to Office of the Comptroller of the Currency or Office of Thrifts and Savings - depending on what type of bank it is. The complaint might not do anything other than create a slap on the wrists, but enough of them get the banks scrutinized by OCC or OTS, so it's worth doing.
This answer does not constitute legal advice and does not and is not intended to create an attorney-client relationship. The law may vary depending on the state in which you reside. It is intended only to give some direction in which to seek assistance.