Long turnover time and delay tactics to find a reason not to pay

I submitted a claim on the 6th of August. They took a month to get back to me. They didn't inform me that the vehicle was written off and l have to find out from the s**** yard place when l had to take it upon myself to find information about the claim.

After that the assessor confirmed that it's a write off. They went quiet again, and came back to me with the report that they want to see if they can repair the car.

It was all a delay tactic to look for a reason not to pay. 2 months later they inform me that the Tyres were is bad condition hence they cannot pay for my claim.

My question was, how come the initial evaluator didn't mention that and why did it take so long to recognize that Tyres were in bad condition