can u mention what is the counter FIR that he made against u?
All i can say is dont waste time just get out of it, anyways u had ur insurance right
these ppl are very used to damaging others cars and they have experience that nothing happens
couple of months back, a dumper crashed into my car from behind that too!! my good luck was that it happened in front of traffic police, i also took my police friends help, and u know how dumper owners are, garbage business garbage ppl, chhapri types, initially police my side, later on they were just neutral ,he was insisting he will cover all via his thirdparty, i wanted nothing of that sort, i simply took a few thousand from him and used my own insurance