Send them an offer to buy the domain for amount xx. Calculate xx with your actual cost plus a small fee for your shock to read this letter from their lawyer. Gi

Send them an offer to buy the domain for amount xx. Calculate xx with your actual cost plus a small fee for your shock to read this letter from their lawyer. Give them a clear, fast timeline how to get the needed domain. Tell them the domain was never active used. Make sure xx is low enough to not start a suit again you.