Okay, like tetsuma, I'm guessing. First guess - it's Portland, Oregon and not Portland, Maine. Second, I'm guessing it's a big box store who has "so much business" they could care less about "making it right" i.e. Copelands, Garts, or GI Joes. Then again, maybe REI or Hillcrest since they have more than one shop in the Portland area.
It seems pretty simple too me....the shop ruined your skis due to their incompetence, therefore, they should be bending over backwards to make it right i.e. replacing them with the same item or a comparable item of YOUR choice. But if the shop does not care about you as a future customer, they very well may insist on giving you your money back and tell you to go away!
IMO, you gave them way too much time to rectify the situation and now they are not taking you seriously. The sense of urgency has passed and the shop is not feeling any pressure to make you happy. Good luck!