If you bought the phone at Best Buy, they will be responsible for it otherwise, take it to a specialized technical service.
First, check the connection and power source, maybe a different plug, did you buy this at Best Buy? If so get in touch with them, maybe the they will check it for you, hope this helps, Sorry
You can make an appointment with Geek Squad or on AppleCare.com for service at Best Buy on Harbison, as they are a certified Apple repair location. Whether the phone is worth repairing or is covered by a warranty or protection plan is up to which phone and when you purchased it, however.
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