Headphone jack

i got a new iphone 6+ under warranty 2 days ago due to bad camera. Last night i was listening to music via audio jack in my car. If i moved the phone it would pause. Didnt think much of it. Now today the headphone jack doesnt work unless you plug the headphone chord in 3/4 of the way and only plays one side. Any advice? Its still under warranty lol its only two days old