I had a nightmare situation a few years back with a ZenFone 6.

It bricked itself within a week, and after I sent it in I got months of radio silence, until I started calling them about it. They had no clue what the status of my repair was, there were a ton of orders for part after part, and it just kept going.

Eventually I just started pressuring anyone I could with "I need a new phone, this old one is falling apart, I can't just keep using it for months on end as you figure your shit out" and they eventually relented, instead just giving me an entire new unit.

Last year I bought an Asus monitor with clearly advertised "on-site-warranty" (which means a courier comes to your house and just drops off a replacement in exchange for picking up the old one), it was DOA.

I thought great, "on-site-swap" should have this sorted by tomorrow. I started the RMA and the first thing they want me to do is ship my monitor to Germany at my expense. I said "fuck no", and instead returned it to the retailer as I was still within the return window, and then just walked into another retailer with more in stock, to pick up another, which then worked.

Then, months later, some dude calls me and asks when I'll be home for my on-site warranty swap, straight up dropping my jaw to the floor. I know I cancelled my RMA.

Lo and behold, the RMA case-number wasn't even the same, so for some reason Asus decided, on their own, to open another RMA, WITHOUT TALKING TO ME for a monitor I TOLD THEM I WOULD BE RETURNING. Maybe someone tried to fix the fuck-up of not honouring the on-site warranty, but holy fuck if that took two months, thank god I took it into my own hands and got it fixed within 24 hours.