How could I get a refund after buying the wrong Otterbox Defender from T-Mobile?

2 Sundays ago, (two days after the initial release) I bought the iPhone 5S in gold (16 GB) along with a case. A store associate told me to get the 5 case, since they are the same model shape. So I bought it, now two weeks today, I realized it's the wrong case, and an Otterbox 5S case accommodates the fingerprint sensor by having extra space. I'm not satisfied and want my money back Can I get a refund for this? Thanks.

Added (1). I still didn't get the 5S as they still didn't deliver it to me yet.

You should be able to get a refund, so much as you still have the packaging and receipt to take back with the case.

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