Iphone 11 call listening problem

Last month when answering a call, I noticed that I really couldn't hear the other person talking. I checked the call volume and it was up all the way. I went into settings / sounds & haptics to make sure everything was up and still couldnt increase the level of sound coming though in a call. I have restarted, hard rebooted and today have done the new update and there's no change in what I can hear while on a call.

On speaker sound works fine along with initial call ringer volume. The phone has not been dropped nor has received any current trauma, just cant hear during calls.

Help...what can I do to increase the volume of the person on the other end?

Ps: Also had my partner use the phone to see if it was my actual hearing and it's not. Totally the phone.

Thanks!