I documented everything and my frustrations with their software not working or supporting modern operating systems and sent it over to people who seemed high up - email, twitter or reddit.
later got a call asking if they could show it to the board because as employees they had the same frustrations and I said sure. next day they announced that their president was fired...
Good ol backup exec - if it errored it was working and no errors meant nothing ran.
The issue was that their line of thought was; Well according to Dutch standards a vacuum cleaner has a life expectancy of 5 years. So if you want to replace something in it after 5 years (even if it is a customer replaceable part like a HEPA filter), it's not a replacement part / consumable, it's a spare part (which are usually more expansive). Which is also why I asked them; "Does that mean it is the official stance that you shouldn't expect your vacuum cleaners to last much longer then 5 years? Because that HEPA filter certainly needs replacement after 5 years.". Obviously they never answered that.
BTW We are talking about a premium house hold appliance brand here. The vacuum cleaner now costs well over 500 Euro. But when I bought it, it was about 240 Euro's or something. Sells for 700 dollars at Walmart it seems.