Totally this.Probably not what you want to hear but you have your money back - move on and find another car.
The dealers will say you have your money back and they aren't responsible for the plate costs etc
yes, it's cost you some time and a little money, but dragging it out any longer will only cause you hassle , stress and more time spent.
Focus on getting a new car, and moving on. with things.
Plenty of cars around, the OP could get one today. I'd focus on helping my pregnant wife in this situation and just use the energy to find another car to our liking and move on.