As I see it.... You ignore the noncompete and see if they sue you, you sue them and try to get the noncompete declared void as to your location, or you abide by the noncompete and deal with the financial consequence. Unfortunately, I can't guarantee what a court or jury will conclude, in relation to whether or not you approved the change to the contract. But if the date on the contract remains unchanged, and it's for your old location, that should weigh in your favor.