Can seller of a property come back after closing for more $$$?

[Josh Bakhshi]

I recently closed on a property that was offered by an auction company. In the contract it did say that I am responsible to pay the commission for the auction house. The seller picked out the title company. I got the HUD from the title company and wired the funds that was requested, got confirmation deal closed, took possession of the property and got the title policy along w/ the DEED. The seller realized a couple weeks later that the title company (the one the seller chose) made a mistake on the HUD and showed the Seller pays that commission. Two weeks later, they are coming after me for it. Do they have a case?