Worst customer experience I've ever had

So I purchased a series x last year (end of febuary) and had heard of the suggestion to keep it away from walls and anything that can block its vents as it could cause them to overheat. Planned ahead and bought a extra desk, and a large Dyson fan to dedicate to said effort. Long story short at about 8 months the xbox started shutting its self off, mainly only on vanguard, but had on one other game in the past right after I first purchased the console (maneater?) So I was just thinking it was a software issue due to some new update. Especially since it seemed to always be before I could even get 5 min into an online match. Waiting a bit for a new update, but instead, to my surprise it. Out of no where, started turning itself off during elden ring, and is so frequent that it is unusable. I called customer support right away once I realized this was a hardware issue which baffled me, knowing that I did everything anyone practically could have done to avoid overheating issues. To my surprise, had the least helpful, and extremely unpredictable reply that my xbox warranty had expired a week prior and that it was no longer covered under warrenty, but that if i paid 300$ (more then 60% of sticker value) that they would fix it. I still have my original xbox 1st gen ive had since i was 12, 20 years ago, and it still works perfectly and never had to send in any xbox ive ever owned and still have every console with far much more hours on them. Seems like xbox would have enough integrity to admit that these issues with their most expensive console to date is faulty, and not their diehard fan bases fault as if there fans are messing up these xboxs in a clumsy, uneducated manor, rather then it being poorly designed. Is the series x shutting its self off based on software that Microsoft programmed to shut off to keep it from burning up?? And in which case, could I disable said software trigger? Ontop of that, I had escalated the conversation in a polite manor as it is not the cs reps fault as if she specifically designed my faulty console, and the supervisor was eating popcorn and didn't want to offer anything more then repeating they can't do anything due to it being a WEEK out of warranty. Had I of known I would have called the first time, doesn't xbox collect crash reports? Wouldn't they have seen my xbox was crashing due to their software trigger over temperature. The thermal pads in these that come from factory are not always full coverage from what ive seen in others vids and could be the reason? Is there anything I can do from here? I cannot afford 600$ every year, I could afford a gaming comp. Is this similar to the zune fiasco? I am just baffled at the utter lack of support, especially if they want fans to be able to keep purchasing games and staying on game pass ultimate (I have had for years. But I cannot even get on at the moment) terribly disappointing and sad. Feel like one of my heros stole my wallet while I thought they were taking the time out to help me or sign my hat. Does anyone have guidance on what steps to take from here?

:)