IMO after only 2 months you have the legal right to reject the car and either ask for the return of your money or a brand new one. I am assuming that the mileage is very low.
Threaten this and see where it gets you, unless you have tried going right to the top of the dealers who sold you the car in the first place. Any threat of legal action, with the risk of having to meet your [not inconsiderable] lawyers fees and the attendant bad publicity, especially when the law appears to be on your side, should frighten the dealership into capitulation.
Really sorry to see your problems; a Boxster is a great car. Hope you meet with success and that the dealers will play ball and give you something extra to restore your faith in modern Porsches.