Sound for calls
I cannot hear anyone nor can anyone hear me on a call. Even when I record a video the sound is not getting recorded . However I can listen to music and videos
See this support guide:
If the microphones on your iPhone, iPad, and iPod touch aren't working - Apple Support
If you get no help, have your device inspected at an Apple Store or AASP: Apple – Location Selector
After checking it out, they'll give you all the available options.
Regards
Giulio