Pitbull
Verboten
yeah you are not going to be happy with the proof I provide, the claim number is sort of sufficient to cover most of those things
I don't know how you expect the insurance company to provide a representation confirming receipt of said letter, that's going to be an easy one to get through a call center.
Unfortunately my own correspondence I lost with an email spam, but I still have the claim number and a pic.
You are waging your bet on the suspicion that no one will be able to get the claim details. I have news for you. Couple of people on here actually work in insurance and can pull that claim history. So just give the insurer and the claim number and we'll settle it once and for all.