I understand you are experiencing issues with your A30. Here are a few steps you can take to attempt to remedy the issues.
Make sure your mute cable is not muted. You can check this on the inline mute cable. The mute button should not be showing red.
Unplug the headset from the MixAmp and plug it directly into a smartphone. Make a phone call, and see if the recipient on the other end can hear you.
Refer to the quickstart guide and try using the headset and MixAmp on a PC. Use a voice recording program on the PC and check your voice output and quality.
If these steps did not alleviate the issues you were experiencing, please go to the link below and submit a case. Let your agent know all the steps you tried and the outcome of your troubleshooting. It will help speed the resolution of your case!
Support Channel: https://www.astrogaming.com/contact/