Are you saying your home is under contract currently, but there is a dispute? What does your REALTOR say? Different areas handle things differently. Here in CO you can have your home listed as "Active/Backup" which means it's actively listed and there's a contract on it, but they are accepting backup offers in case the first contract falls through. You should discuss this scenario with your agent and see what your options are. But you can't just accept another offer until the current one falls through.