Might be a bad example but that stuck to me: Under no circumstance, you should talk like this to customer service. Always remember that the other end is a human and being rude makes it hard to offer a solution.

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How do I deal with support? Start nicely (with good companies that's all you need) and slowly provide hints they screwed up allowing them to keep face as well as being the one offering it instead of reacting to the demand. If they don't understand: tell them. The last resort is the blacklist (company, date, reason) paired with DNS blocking (in case I forget about it).

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Want an example of a blacklisted company? Asus.

They don't have any technical support unless you are an influencer or some big shot buying frequently truckloads of products. I might be able to get somewhere by being a dick but do I always want to push hard to escalate it?

Just call it a day (aka. scrap those products) and buy Asrock. This was definitely a quality-of-life improvement.

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Btw. Extracting firmware can be difficult. Nordic had a horrific bug in the NRF52, WCH has a bug in the CH552 allowing to out the firmware by software. For ST STM32F it's complicated. They have a design flaw but exploding it requires decapping the MCU and knowing in which area of the die the readout protection bit is located. Haven't checked if they fixed it with the newer G, U and MP series.