Can I return my Bose QC-15?

I know there's a 30 day return guarantee for your Bose headphones if you don't like them, so please don't just say something like that, my case is a bit peculiar. I just ordered my Bose yesterday, and I ordered them with a 12-month payment plan, meaning I would pay $25 each month for a year until they were paid. I just paid $43 ($25 for the first month, $18 for tax). So, my headphones haven't even arrived yet. My problem is I'm against leather (please don't ask), and the ear-cushions on the Bose are leather. The website said nothing of the sort, I actually found it out on someone's review (best buy also marks the ear cushions as being leather). Now, I don't even really want them. If I had just paid full price, I'd have no questions, I'd return them, but it's the payment plan that's making it confusing for me. I'm a little worried to contact them since this is a bit cynical sounding (I just made a payment plan with them and now I'm trying to cancel it). I'm curious if anyone could give me any insight here.