Keep thorough documentation, ask new shop to do the same, go to court. Get Your $$$$ back. I re-did a head gasket for a neighbor of My Folks long ago, had a "pro" somewhere else do it after having suffered a stroke, lasted maybe 2 mos. FWD Iron Duke in a Buick, looked like they gunned the head down from one end to the other, w/a visable diff in compression. Took the gasket with Him, walked out of the Magistrate's with His money back, incl. Court costs.