A known family of local scum claim that we put a scrape a down the side of a car parked on the side of the road. The scrape on the side of the car is 12 inches off the floor we had the the tedder on at the time and it travels approx 3ft off the floor we 100% know we didn't do it but they are persistently asking for money and threatening with insurance etc. We've said we're happy to get the police involved but don't know how to prove we didn't do it. Trouble is they are the kind of people that will do something like let cattle out or set fire to bales etc. Any advice appreciated thanks