Review Atrocious, rude and negligent service

I am a disabled pensioner. For 3 months my ADT security system has been seriously out of order. Suddenly, after Christmas, it began producing false alarms every week or so,terrifying to a frail old person It happens at random, but more recently when I plug in my laptop, or switch on a light, let alone a thunderstorm even in the distance, it goes off. Then it will not allow me to re-arm the system in any way. And carries on through the night
peep-peep-peeping saying the door is open when it is not. So I have spent too much time in three months, being charged the full rate, with an alarm system that refuses to switch on, and thus unprotected.
They are seriously understaffed, though not keen to admit this.
When the problem erupts on a Friday, they can;t send anyone or even take a booking for Monday, so Monday you can't make an appointment for technical service, which is overwhelmed by callers from Friday, Saturday, Sunday and Monday, trying to get help, When you get through, they suggest Wednesday, meaning you are insecure for nearly a week.
Today, having had the system nor working since Friday, I had an appointment for a technician to come. He didn't, and nobody called to explain, which isn't his fault, but sheer bad management. When I try to call Mr Califani, who had told me to do so, he is never available now but "in a meeting" ( yeah!)promises to call back "now-now" which hasn't happened in 3 or 4 hours. and doesn't bother to respond to e-mails. He has been needlessly rude, and avoiding taking responsibility.
Eventually, someone else was good enough to contact the special technician who was supposed to be here this morning, who came later, made some changes that might fix the problem,and which should at least help clarify where the problem lies. He will call back on Monday to check how its working. Nobody has bothered to apologize for all the problems and continuing danger caused to me by inadequate technical servicing. I have still been charged fully for a faulty service often impossible to use at all. Mr Califano is, I've been told, head of the Technical division, yet while he was hiding from me today, I asked to be connected to the Galifano's boss, such as the General Manager of the Pretoria section, and was told that he was that manager and the only senior person at the office. I have been told, more reliably, that this is not so. I don't think it's a sign of a healthy and well-run company, for this to happen.