Issues with the Razer Kraken BT Headset

I bought these headphones for my friend. When she uses them, the audio is bad. So I had her download Razer Synapse 3. Once installed, her audio is amazing but than her mic won't work. We tried everything we saw online to find help and fix it but nothing works. The moment, we uninstall razer synapse 3 from her pc and restart it. It gains the ability to use it's mic again and works. Please help, It was a rather expensive head phones and I wanted to do something nice for her but after 6 hours of trying to fix it. They are a nightmare and I am tempted to return them.

Someone please help...