Shocking service from Fidelity Services

The worst experience of my life.I paid upfront for beams and cameras sold to us by one representative of ADT who disappeared and then another ADT representative told us that the beams we bought were not correct and that the cameras were not really necessary.This happened a month ago and no amount of follow up has resulted in anybody having the courtesy of phoning me back or responding to emails!We still have no security and as an elderly couple that leaves us vulnerable! What do I do now?