Client caused accident and AON refuse to pay

A client of AON bumped my car in April 2015 causing massive damage to the entire right side of my car. Police reports were filed, all paper work was completed and submitted. AON never sent an assesor to assess damage to my car, agents never took my calls or responded to my emails. AON just kept taking messages, said they will get back to me, and kept passing the claim to another agent. This is probably a delay tactic of theirs i presume. They never fixed my car or paid me to fixed it. Now 4 months later AON still refuses to pay me. Now all of a sudden AON says their client never caused the accident. But their client submitted a police report admitting guilt. AON is such a big international company, R24000 is hardly going to make them poor or cause them to close their doors. AON has caused such an inconvenience in this period of my life. I am pregnant and am supposed to be enjoying this experience. instead I have spent my pregnancy running around getting quotes for them, phoning them and emailing them. i really can't believe this from AON, they show no symapthy or remorse for the manner in which they conduct their business.