No feedback to slow alarm response

After receiving a call and being informed that my alarm has been activated, I asked ADT to send a guard to investigate. I finished the meeting I was busy with and decided to go check and make sure there was no open windows in case that triggered the alarm. I arrived home only to find the guard not there. He only arrived 30 minutes after they called me to inform me of the alarm. <br> <br> I then called the call centre only to be informed that a senior will contact me later during the day. It did not happen.