Third-party claim delay

I am a third party claimant of Budget Insurance. A family member of a client of theirs crashed into my car from behind on 05 March 2025. I sent all documentation to them and an assessor of theirs as they have requested from them. I do not receive any updates from them until I call them all the time. I called twice this week and they advised me that the matter is with their manager for approval. When I called them again on Tuesday (01 April 2025) they told me they are doing further investigations. I have supp**** them with every document they have requested and they are still delaying dealing with my claim. Tomorrow is the 30th day since my car was involved in an accident with their clients car and it hasn't been resolved.