THERES A GUY OUTSIDE MY GIRLFRIENDS HOTEL ROOM!!!!!!?

Ok I'm not ******* around with this!! She's with her parents! She's 18 and they went on the trip. Well her mom is 32 (yeah I know) anyways she talked to this guy at the cafeteria below and now my girlfriend is calling me crying that the man is outside waiting for her mom and like a retard the mom told him her name and hes even calling the ******* room! What can they do? Please just answer this! They think the man is on drugs!