Or you can ask to meet with the Assistant to the Regional Manager.....Dwight Schrute.
Or, you could ask them to speak to the Assistant Regional Manager Trainee.... Dewey Cheatum.
OP: Good job, sticking by your guns. Sounds like they're pooping bricks, and hard to believe that even the store manager is such a dick about all this. Obviously, they're not thinking about your needs here, just theirs. What a way to run a business. I retract my original recommendation, after hearing how you were treated when returning in good faith...