I got the iPhone 7 Plus red product and now 3 weeks later the mic isn't working for calls

I was talking to someone today and the person couldn't hear me anymore. I was trying to charge it and then instantly I guess they couldn't hear me anymore. I tried calling another person, but they said the same thing. My mic works for Siri, Videos, Facebook messenger. What can I do to fix this?

Its called Product (RED) by the way.

Should take it back to where you bought it & address the issues.

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