Xbox One software update sabotaged and broke my console - how do I complain and demand a...

I have a large number of frustrations with the Microsoft Xbox One service - one of which is how difficult it is to complain!

I will aim to be brief.

• I own an Xbox One. I played the new Star Wars game a couple of months ago, all worked fine.
  
• I switched it on yesterday and it powered up as usual. The blasted thing insisted on connecting to the internet in order to let me play my games (which by the way - what the hell?? I bought it, I own the games, let me play them offline! It's none of microsoft's
  business whether I connect to the internet or not!)
• When I connected to the internet, the console insisted on downloading a software update. Again - what's with the dictatorial mandates? It should be my choice whether I want to update the software. Fair enough for online play, but in my own home I resent
  being ordered to spend two hours downloading something I don't even want...
• The download froze at 84%, with no progress for an hour. Then it switched off.
  
• Then I spent an hour trying to find assistance on the customer support site. Eventually I tried the factory reset (losing years of saved games and data) and even the Offline Reset using USB. More hours wasted. Still doesn't work.
• Tried going back to Customer Support. Zero support - just sends me round in circles.
• Tried warranty registration - says my warranty is expired. Well, fine if *I* broke it, but MICROSOFT are the ones who broke my console with their rubbish update!
  
• I am now extremely displeased and irate.
  
  So in summary: I wanted to turn on my console and play my games. Which I have paid for and own. This useless company enforced an internet connection, then a mandatory software update, and has now broken my console. To add insult to injury, they don't even have
  a proper complaints procedure to hear my concerns.
  
  What do I do, team? I'm furious. Microsoft needs to replace this console and apologise.
  

:)