If Killswitch said there was an oil leak in the turbo, there probably was. We need more information before we can help you with the shutting off problem... KA turbo or SR20 engine? Injectors? Stock turbo if an SR? What size turbo if it's a KA or has a bigger turbo on an SR? Other mods on engine?

Personally, I would have left it at KS. They may be slow, but they are good people. They're slow because they are busy, and if you tell them to take their time/that it's not a rush, they will treat it as such.