This happen to me once. I got an ,attorney to write a threat about breach of contract. Seller’s lawyer contacted me, I made him cry. Opened mediation at local SDAR and got the deal closed. I did give up some little things but if it’s a killer deal that’s o.k.
Do you know why they want to kill the deal? I would find that out. Maybe it’s something so bad you don’t want to deal with it or maybe it’s not that big of a deal like in my case.