If he's a tool you are screwed, eventually, no matter what you do. Tell the company you have your vehicle scheduled for service that day and that you'll have to rent a car and expense it. Tell the tool it's a rental so that he won't try to draw any conclusions based on his opinions of the vehicle.

You mentioned you were advised not to take your X. Advised by who? Do the people with the advice know the tool better than you?

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Wake up every day that would be a start.