When you called Canon, what did they say?
Sorry, I know you're frustrated, but $h!t happens. Occasionally, a bad lens is shipped and someone gets unlucky. Sometimes, a whole production run has a goof, and there's a service advisory (aka recall) - I still need to send my 1D X in for that, actually.
So...venting is good, but getting your problems fixed is better.
Hi Viggo, I think this is good advice, take a breath and work out your options, then take action.
The 200 f/2 is an amazing Lens, one of the best I own, and other than nailing focus at f/2 (Needs a new Skill set), this Lens should just work.
If you purchased the lens new, return it to Canon and ask for a replacement, if you purchased it 2nd Hand, return it to Canon and have them repair it, the Lens is an investment, spending a few dollars on it wont be a bad further investment.
Nuero is correct, sometimes crap happens, it's a huge PIA that's for sure, but Manufacturers like Canon don't always get it right, the recent 1Dx issue is a prime example, fortunately my two Bodies went in, had the adjustments, came out fine & seem to be working as they should, but it's damn frustrating to spend 15k on 2 1Dx bodies and then have the need to send them back in for "adjustments".
Stay cool & work the options, I hope you get the Lens sorted, it's an amazing piece of Glass, 99.9% of the time.
In the meantime stay away from large Blunt Objects when around the 200 f/2.