Band new iPhone 6s, put on a case ruined volume button, possibly defective?

I just got a brand new 6s, putting on a plastic/rubber pelican case, I put the phone in first on the sleep button side, then pushed the volume button side in. The buttons kinda got crushed by the rubber but I didn't really think much of it I thought it would be able to handle rubber, they were only under the hard part for less than a second as I just popped it in. But, the volume down button was lodged in, it's flush with the phone now, it does work but it feels really lose, you have to push on it much harder, and it makes a very quiet click compared to the distinct click the volume up and sleep buttons make. I feel really bad having this done to my brand new phone, do you think it's defective? I just can't believe this happened so easily.

Nope

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