Sold tickets

Ticketmaster has not paid on tickets that I purchased and gifted a friend who sold them on Ticketmaster. They spoke to my friend and TM stated that the tickets were stolen. They were not reported stolen since I purchased them. I’ve called the fraud line and left messages around 10 times and no one has called me back. Any suggestions regarding who else I could call or email? Not sure how to help my friend get paid on these valid tickets.