I think you are over reacting. The stuff you are talking about is minor and these types of things happen. Sounds like they are doing everything they can to make you happy. They won't be giving you a new tractor over this. Even another new tractor will have some bugs to work out. My tractor been back to the dealer 3 times already before 50 hours.
x2.. not trying to be mean. Just because its new, doesn't mean it won't have problems. There's always mistakes, nothing is perfect in life if it was, it would be very boring.