Worst Service ever

I logged a claim on 23 March 2022. On 6 April 2022, I was advised that the vehicle would be written off and I was requested to provide the settlement letter. I provided the settlement letter on 8 April 2022. Ever since it has been a back and forth with the claims consultant. There was a dispute with regards to the amount to be paid. Eventually on 19 April 2022 they agreed to pay. At this point my settlement letter had expired. I requested another letter from the bank and provided it on 21 April. On 24 April I was requested to sign an agreement of loss letter. I then advised the consultant that the amount on the letter is incorrect and requested an amended letter. I even told her where she made the mistake. I made numerous calls to the call centre to follow up on the letter and asking when the bank will be paid as the second settlement letter was due to expire on 28 April, but it still has not been received. The consultant replies to one of the emails and advises of the correct amounts but and says I must sign the agreement of loss letter but she doesnt attach the letter. I had to request it again. She eventually sends me the same incorrect letter to sign. She does not confirm whether the bank was settled and she was fully aware of the expiry date. I have spent hours on the phone and sent numerous emails, I also escalated the matter to the escalations department, and still no joy. It is now more than 5 weeks since my claim and without having a car and discovery does not seem to care. My second settlement letter expired yesterday and they have still not confirmed whether it was paid. Every time I request a letter the balance increases due to accrued interest. Who is going to pay for the interest? This has honestly been the worst service i have ever experienced. They don't care that this is costing me so much money and time wasted. The lack of response from the claims consultant is just pathetic to say the least.