Sorry to hear about your poor experience with GP, and welcome. It says a lot when someone goes through the trouble of registering for a forum that doesn't support 1/2-click SSO just to vent. Many years ago, GP would have been the only local dealership I would consider bringing my Ducati's to when I couldn't/didn't want to do something myself. Now they're just like every other place. Curious who you're using instead. Ken Livingstone is the only other person in Ontario I've trusted them with. Another tech by the name of Giovani comes highly recommended as well, but I have no experience.
That said, nobody's perfect and even the best can have a bad day. Back when I first started riding, I couldn't afford to pay someone to service or fix my bike, so I had to learn how to do everything myself. Now I still can't afford to pay someone else - not because of the service cost itself, but because of the time, aggravation, and ongoing costs of fixing things that I basically paid to have damaged or done improperly.
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While I agree they should have followed your direction about not starting it, if your concern was about the old fuel in the tank damaging your fuel pump due to moisture accumulation and water separation, that would have already happened from the same fuel inside the pump body. Assuming you have OCD like me, I hesitate to mention how long I've stored and subsequently run my 998 on old fuel when my OCD was trumped by my laziness. Bike is over 80k now and still running strong.