***? It's like I'm in the twilight zone on this. If some random stranger offered dent repair, no, but suppose I was out of my mind on alcohol, blow, and had hookers so I was "busy" (I am kidding)... then, when he wanted $100+, I'd laugh my arse off and contemplate what to do with him. Do I have a burlap sack and reasonable proximity to a desert and a shovel?
"Very persistent and will not let you leave easily"? Trust me, he's the one hoping I let him leave. That's so ridiculous. If you are a female and might feel intimidated, I suppose it is a reason for pepper spray, stun gun, etc.
It's not a scam. It's an idiot and when his wax doesn't magically fix a dent, you don't pay him. Instead you laugh your arse off.