AdT **** system

I have a faulty system that ADT won't come out to check out why all because they are suspecting that the back up battery is faulty and I must replace it before they can do anything. This was installed 6mo the ago and unless I pay my hard earned R700 for a new battery I'm stuck with a system that arms itself and goes off at anytime of day. I don't know what to do anymore. I've asked them to cancel my accounts which is so long, 3yrs long, they just won't budge. I don't even know how I can switch the damn thing off. When the the power goes off the alarm sends a signal, when the power returns, there's another signal. The guard is so quick to come out but they are so slow in responding or xancelling the unit and account..