First thing I do when something crappy happens to me is I look in the mirror and try to be honest with myself if I set myself up for problems. Usually I did. Same thing here. Paying for a bike without looking at the VIN, with no paperwork, out of a garage, with just a handshake and a promise?? C'mon!! I'd be looking in the mirror going DUH! What was I thinking? Darn leprechaun didn't give me the gold! He said he would!
You bought one of the 125's that had the frame upgrade, I'm guessing, so you'll have to go to your BMV and creat a Vin for it as suggested. It's not that hard, my dad use to build frames and did it all the time.
Unfortunate there has been no mention of who the seller was--kind of one sided and absolutely no help to anyone. I feel empty after reading this thread....