Awful customer service from ADT

I'm extremely disappointed with the service from ADT. We took an offer for home alarms and armed response from ADT about a month ago and they still haven't installed the alarms to this day. A the time we gad to be the ones calling and asking them about the installation and they kept promising to get back to us until today when they called and said they were coming to install the alarms today and somebody must be home to grant them access to our house. My wife took a half day off from work and rushed home. In the afternoon (around 14:00) they were still nowhere to be seen until I called and complained. Now that I complained, the guy came and put some wires and left, he said he will come back and complete the installation on Thursday. This means one of us must not go to work oh Thursday and wait for them to come, if they will come. I'm really worried about the service we are going to get from this company if their client service is this bad from the beginning.

I hope they understand that we are not installing the alarms to decorate the house, but we are doing this for our safety and security.