If the other person mentions that the sound is distorted and difficult to hear during the call, please try the following solution below.

Check the distance between the mic and your mouth

If the distance between the microphone and your mouth is too close (E.g., talking with the earphone microphone close to your mouth, or having the microphone part of the headset extremely close to your mouth), the sound tends to be distorted. Please use the headset at the appropriate distance.