Outsurance chain collision claim nightmare

On the 22 of January, I was involved in a chain collision on the N1 south, just before Rigel off ramp. I was in vehicle A. I came to a hard just stop, not touching the vehicle in front of me. Vehicle B also came to a hard stop, not touching me. Vehicle C slammed into vehicle B, pushing B into me, vehicle A. Vehicle B's driver went to do the accident report. I am with Outsurance and too say I am disappointed is an understatement. Vehicle C is also with Outsurance. I thought this might make things easier. Vehicle C is denying my claim against her, saying that vehicle B hit my car, and then she hit him. 2 drivers against one drivers version of the events, and they chose that person. If I put the claim in against my Outsurance policy, I lose my Outbonus. I can't put in a claim against vehicle C, because she is denying the claim. Outsurance is just giving me the run around. If I don't get a call back from one of the assesment managers soon, as soon as this thing is sorted out I am changing insurance..Outsurance...not happy at all with this service. Disgusting is a nice way of putting this experience