Hey @SteveB1903 ,
Let's try to run a hardware test on your phone to see if the receiver is working correctly. To do this, you just need to follow the steps listed below:
1. From the phone dialler, enter *#0283#.
2. Select RCV Packet Loopback ON (it may appear as Start : RCV_1stMic on some devices).
Say a few words as if you were on a call. Can you hear your voice correctly?