Great deal, Can't find mortgage release, Seller paid off years ago

[Spencer I.]

I have a deal with a great potential profit. The property has been vacant for a few years, and the seller is highly motivated. Title came back with a lein for $65k from the original mortgage company. The seller informs me the mortgage has been paid off. Come to find out the mortgage company sold the lein to another company, who sold the lein again. The seller has proof the mortgage is been paid off, but as you know all the title company wants is a release of lein. Is there a way we can get a release? Or is the deal dead and she will be stuck with the property?