What disturbs me, is that your question is not: "How can this situation be resolved?" but "How can I inflict punishment on the seller for annoying me?" What is your real goal? to get closed and get into the house?, or to make the seller pay for your inconvenience?"
Make sure your agent speaks with escrow and the other agent to find out what's going on. If it is a temporary situation, you're probably best to make your peace with it. If it is something more serious and potentially long term, you might have to consider moving on and pursuing them for breach of contract.
I would certainly dig deeper though to determine the source and length of the hold up.