Unwilling to assist with claim

It is now almost 6months after filling a claim and they still haven't resolved with the 3rd party and forcing me to claim for it. As they can't make up their minds as to who is at fault. So my car is getting rusted and they not willing to sort it out. But want me to pay for damages that isn't even my fault. As in police ACR the 3rd party has confirmed that he was at fault