Terrible service

ADT has the worst customer service I've ever experienced. I have been waiting since the beginning of May for someone to phone me and arrange an installation date for my alarm system. I am an existing customer that moved premises. I have to phone them almost daily to find out what the problem is and all I keep hearing is that someone will phone me back. The person that did the quotation also keeps promising me that he will find out and let me know but never does. They were very quick to nag me for payment but now since they have my money they've gone dark. I am fed up with these people, I will look for another company that actually cares about customers. If I can't even get the system installed, I do not want to know how they actually handle the rest of their business.