Aircon broken after Panel Beater Repairs

My car went in for panel beating. Repairs to the front of my car. A few days later my air conditioning stopped working. On further investigation it was found a pipe broke due to my radiator being loose...<br> <br> FR Auto doesn't want to take responsibility and are blaming me for the damage, even though they were the last people to work on the front of my car. I have reported it to the RMI as well.