They will probably refer you to Aikman anyways. I would think they'd replace it, or at the least repair it...but I can't be sure having not seen the rod.
Even if Le Baron agrees to take it, I highly doubt they would give you an over-the-counter exchange. Most likely they will just send it to Aikman themselves, so you may as well cut out the middle man if you don't mind going out to Mississauga.
EDIT: I'm mostly talking about the Markham location, where I was. I see that you're in Missisauga anyways, so I'm guessing that's the location where you bought the rod. The manager there is Adam. Since you're in Mississauga, you have the receipt, and the rod is under warranty, I would just take it to Aikman myself.