Moto G4 Plus Microphone is not working

I dropped my g 4 plus from about a height of 10 feet ,thankfully I had a tempered glass and a silicon case ,on top of it have a soft case, so the screen was safe , the Tempered glass took the impact and there was no scratch on the screen

However the mic is not working since then , I can hear but the caller can't hear me,thankfully it works with a headphone jack,

Need to know if I can fix it though Its under warranty as I don't want it to be handled by the service center.

I can can still use my bluetooth if nothing seems to work