Insurance question

YeSTERDAY i was at a set of lights on a street that was on an incline... the car in front rolled back more than it should of and hit the front of my car... now this old couple put the blame on me bla bla blaa.. anyways exchanged contact details said ill get a quote... anyways got home looked at the marks attacked it with wax and it all came off.. lol anyways this old guy gives me a call saying he got a quote from his repairer for $500.. i call bullshit lol so the question is, what do i do from here, im not taking the blame and paying $500... can i get hime to go somehwere else for another quote? im fully insured but as i said im not taking the blame !!