Constant bad service

On Saturday 7 Nov, we got a call from ADT Call Centre, stating that they received an alarm signal from our residence. We requested that they send out a response vehicle, as we were out for the evening. We heard nothing back and decided to go to our house and check. Everything was fine, so we went back out. I noticed that there was no slip from the response vehicle. When we got back home later that evening, there was a slip. It had taken the response vehicle 40 mins to respond. I could have been ***** and killed in that time. This was a fast response time for ADT. I have waited three HOURS for response vehicles. So, please, ADT, explain to me why I should stay with your company? You charge almost double what other companies charge, but don't bother to do your job. Explain to me how much your billboards, bragging about your response vehicles, are going to help me, when they don't come out if I'm being held up in my house? Explain away...