Use your own repairers.

I did things a bit backwards, I broke the rear screen on my Huawei P20 Pro and Huawei's official repairers were running a special on replacement costs, so I had Huawei collect the phone and just sent Loom the bill (which was very reasonably priced) and they paid out happily.

-1 start because payment took over a week and I had to follow up.