Ridstar q20 problems

I recently got hit by a car and ever since then my bike has been acting very weird, it wasn’t to hard of a hit, few scratch’s mostly just impact to the bike which sucks, ever since then my bike has randomly been stopping, it wi ll be working as normal then the wheels stop spinning, the motor is working I hear it running and it works with all the different modes of the bike, it’s just the wheel doesn’t spin, my warranty doesn’t work cuz the seller is a scammer on Amazon so I don’t know what to do. Plz advise