Shocking Service Alarm broke in early December. More than 3 months later we haven't seen one engineer despite many hours on the phone and at least five arranged visits. Never updated on any of the arranged visit days to say an engineer is not coming despite promises. Got a great response after escalating but still no engineer. Offered to give three months back but we haven't had a working alarm for three months anyway. Escalated again twice and have had no response to either. We've been very patient and very polite but I would now recommend anyone thinking of buying an alarm to avoid ADT. Worse response to a service issue I have ever experienced