First, does your contract have a closing date specified that has passed? If so, have your lawyer write a letter to the seller's lawyer advising them that they are in violation of the contract and you are prepared to close immediately. Although I'm not sure in MA, in many states this starts a clock ticking where the sellers have to close within 30 days. I know that doesn't help much if you want to close right now, but you need to start the clock ticking. Talk to your lawyer and see what he or she advises.