I reported a communications fault with the Smart system on Friday to say the system wasn't connecting to their monitoring centre, the earliest appointment I was given was for the following Friday in the morning. The engineer never arrived and despite several calls I found out he had gone home. I re-booked for the Monday morning and the engineer didn't turn up. ADT do not have the common decency to call to advise, they don't return calls, they leave messages with their engineers because they don't answer the phone and the engineer doesn't call to give an update. ADT customer service is appalling.