Why are my earpods only working on one side while i just opened the package?

Hi, I just have a question about these earpods. So I bought my new Iphone 5 almost 2 months ago and they were shipped with the earpods and all the usual accessories so I thought it was fine. But I already had other headphones that worked great so I decided to save my earpods an use my regular headphones. So like an hour ago my normal headphones broke and I thought lets try my earpods. I plugged them into my laptop but I only heard the music out of 1 earpod, the left one. I thought maybe there's something wrong with my computer and I tried them in my Iphone but it stayed the same. So I was like is this normal and i searched for a review on them and I found out that it wasn't. Is it possible to recieve new ones or do I have to buy new ones? Again I just opened the package and I've never touched them or anything before.