I recently purchased a motorcycle, the person who who I purchased it from never had it titled in their name, (the last person it was titled in had signed it over though). I now have the motorcycle titled & registered in my name. However, the seller is now refusing to let me take the bike off the property & has even tampered with the bike so that it won't start. I paid cash & there was no receipt or bill of sale given. What can I legally do to get the bike?