They were just holding out for better offers, knowing that I could no longer pull out without incurring penalties. Plus they cashed my deposit check on the day they received it, but didn't exchange.
Had signed contracts with a REA in NSW once, but she just wouldn't exchange. After three days, she called me to tell me that she had a higher offer and asked me to beat it. I told her to go and get f****d and reported her to REINSW.