I had the opposite thing happen. I deposited a check for four digits into a business account and someone screwed up and keyed it in as a seven digit deposit. So for three days I had over a million dollars in the account. I had no idea until I got my monthly account statement. For weeks, every time I went to the bank whatever teller I got would say "Whoa, someone really screwed up, huh?"
Buglover, can you call the mortgage company and basically make them reverse the charge?