how can I fix my bluetooth module on 2009 fiesta econetic?

The bluetooth stopped working on my fiesta econetic 2009 model. Somebody was supposed to fix it for me. Now When I press PHONE button the display shows MUTE sign and radio/cd player stops. Before it was showing BT OFF and stopped working with my phone. Any chance you can suggest me how to fix this problem please? (the person says he disconnected the battery and bluetooth module)