Give the car back, I am sorry bro but there is no such thing as "there is no other car like this". you r heart and pocket might bleed later on and you will then kick yourself and say, i should have taken the car back.
Let it go, it is a car and possible problem child in the future, do yo really want to have the car with a dwindling grey cloud about your sunroof everyday?
I let my very first turbo car go back the dealer only because the defect was too great and they offered to take it back, at that time, the deal was so sweet but i had think properly if i want this in future or not.
Good luck bro! All the best!