Dear anonymous,
This question can't be definitively answered w/o reviewing all documentation and correspondence. However, I will point out that you stated that you asked the Sellers for an extension which was denied, this suggests that the closing date arrived and that you were not able to provide funds to close on the closing date. This in itself could be a breach causing you to lose your deposit. The exact timing of the events you described could also be critical.
Answered on Jul 30th, 2013 at 5:10 PM