Utterly disgusted

I am totally shocked and utterly disgusted at the service I received from ADT recently.<br> I recently moved to a new place, and had tons of follow up calls from ADT to take over the alarm system/account of the previous owner. After ADT convinced me to go ahead with them I agreed. The alarm system that was in place in the house was quite old, so I told them to upgrade my alarm system at my cost. So they proceeded to upgrade my system at a cost of around R2200-installation took about 3hours. Before they left I asked them whether everything was in working order and the guy confirmed. He also said I was properly hooked up to the control center. Yesterday afternoon my alarm starts making a beeping sound, I checked out the control panel and it said battery is low.I found it very strange as the plug of the alarm is plugged in correctly. This shows that my alarm system was not properly installed, I then called control center, only to find out that my system has not being sending them any signals since installation. This is ridiculous as I have been paying a subscription yet I had no service????<br> I demand someone call me and that I get a reduction in amount due for the new system and a refund.