Horrible claim process experienced!

Ive been a loyal customer for over 11 years with outsurance, and this last claim process has been somewhat dusturbing. I had accident on the 6 November 2021, today is the 13 December and i still havent got fully paid. I even had issue as they first didnt want to give me a rental but that got sorted. my car was sent for repairs then after a week was told that it was declared a write-off. After 2 weeks after i was told that they looking for quotes from merceedes for the extras on the car and cant get it and i must get it myself. I then started getting this and sent back, still no approvals until i kept calling and following up and demanded to speak to manager. By thus time i had to return the rental as a month now has passed and still claim not finalised. They then got salvage department to collect documents and still i had to follow-up myself. Last friday i was told by Siya as got hold of him from salvage that he is authorising payment and i should receive in 48hrs. Only got one payment yesterdsy and not the payment for extras. Called in this morning and spoke to Lauren from Salvage department was told there was another error made on the payment. After now even not having a rental was suppose to put deposit on another vehicle im still having to wait for outsurance mishaps. Im really annoyed that as a loyal long standing customer that this process is the way it has turned out for me. As im planning to get another car thinking that i might change my insurance as a result!