Clayton, if I was you, I would go to the police station, explain the situation to them, & then have the officer go with you to pick up the vacuum. And I wouldn't worry about whether you have ruined your relations with the vac shop. Rather, I would tell them you will be letting EVERYONE you meet know of your awful experience with them, & encouraging others to take their repairs & future vac sales elsewhere! Maybe that will teach them to use such unethical business practices!
Rob