To fix this issue, please try the following steps;

1. Replace the earbud tips with ones that fit more snugly in your ears and ensure that you are wearing the earbuds in the correct position to create a tight seal. If the earbuds are not worn properly in your ears, you may not achieve the correct call performance.

2. Make sure the charging case has enough power and reset the earbuds by following the steps below:

  * Open the charging case and take out the earbuds.

  * Press and hold the touch areas of both earbuds simultaneously for 10 seconds.

3. Ensure that the audio output device selected is "soundcore A30i" on the connected device and turn up the volume on your device.

4. If you make a call through an app, please try using your phone to make a call instead to see if the problem persists.

5. Turn off Dual Connections.

6. Try testing your earbuds with a different Bluetooth device in a different environment to see if there is any difference.