I have a situation where I own the home, and my ex is solely on the mortgag

Well, there are large pockets of stupidity in the banks, but even with that it's hard to figure out how the bank could not have known that she's the only one on the mortgage.  After all, weren't they the ones who generated the original paperwork that was signed? I'm not quite understanding what the issue might be here.  Is it that they won't talk to you now?   And am I to assume that you're the only occupant of the house now?  Yes, there could be issues in that scenario, but there's not much I can discuss with so few details.