I used Cencom D.B.A. American Digital Monitoring for just over 2 years. I own a small security company and had them monitor my customers. I had several complaints from my customers. 1 person said they never received a call, 2 customers said it was 45 minutes before they received calls and one customer said the person they received the call from was very rude to him. Then American Digital Monitoring doubled my bill. When I called them to ask about it, the person I talked to was very rude and told me to go to another monitoring company. Now that I am moving my customers to another company, American Digital Monitoring said they "missed" adding something in the past and I will receive a very large bill. They built the accounts on their server, if they "missed" something, they should be responsible. In my opinion, if you are starting a security company DO NOT USE Cencom, D.B.A. American Digital Monitoring