MobileHelp review: A final bill

At the end of my daddy's the contract with Mobile Help Account #8101541 I called and cancelled the contract. Next we were unable to get the box off. I informed Mobile Help of the problem several times. Now I recall that we had problems getting the box installed. The box was faulty. After we were able to get the box off of the door. I returned the equipment. Next emails started. I was informed that we needed to complete a release form. After we completed the release form I specifically asked the rep if we were done and she said we were. Next I am receiving emails saying we owe $94.88 and Mobile Health is contacting family members that were listed as listed as emergency contacts. Mobile Help charged us $94.88 when we were clearly not using the service. Now they are harassing me and my family by emails and phone calls to pay $94.88 when I was told we were done and we did not owe anything. I asked to contest the bill and I was told there was nothing I could do. I left a message for a supervisor to call me.