Luna.Tic

I have been in my office for a year and a half and the handsfree doesn't work on any phones here. It used to but apparently the power went out and it hasn't worked since. You can dial using handsfree but no one can hear you talking, but I can hear them. Can someone help me? I find it hard to pay $100 per hour to have a tech come here. Any help would be appreciated. Thanks..