Microphone not working during calls, voice notes and headphones

Hi:

I'm having some trouble with the mic of my iphone 6. Is not working during a phone call (caller can't hear me), taking a voice note, neither Shazam app can recognize any noise/song. The mic was replaced and suddenly stop working, so I started to use the headphones and problem solved.

Siri is functional using the headphones and without them. I read that Siri's mic is located near ear speaker so that's why Siri can hear me.

I've erased resent downloaded apps, hard reboot, verified the mic connection and don't find what's happening. Last thought, the headphone Jack, lightning connector, mic assembly has damaged only the mic.

What can I do to solve this problem?