he said the window pricing is different from east and west coast and each dealer has its own different pricing with Simonton.
While those are true statements, there is no way that they justify that upcharge.
If you have already purchased the windows and you were happy with the overall price, I don't know if I'd push the issue. It is unlikely that he is going to refund you money at this point. Just know that he was being dishonest regarding this issue, and take that into consideration on any future projects or recommendations