Normally I would say I cannot believe the audacity of returning a broken device to a consumer, willfully, Knowing damn well that this buzzing is unacceptable.... All they had to do was swap out your unit with a unit that didn't buzz. Some people genuinely don't notice it or don't care. You obviously cared enough, as did I, to return it and that is how they treat you? Unbelievable, but these days I'll believe it.
Just earlier today I returned mine straight back to Newegg. No restocking fee. Free return label. It sucks though because I'm based in the USA and was able to get this at 730 dollars no tax.
I was planning on buying it again once the manufacturing line matured, but if they're just moving forward with this flaw then it is probably a deal breaker for me. I guess we will see. I'm not holding my breath. Valve index controllers might have fixed the no click issue on the analog sticks, but even they never fixed the sensor that causes eventual drift on pretty much every unit sold. Who knows these days.