Alarm system not functioning

An alarm system was installed at my house in June, initially there was a problem with the system linkage communication to the call centre. It was fixed after a couple of days. Last week I received calls daily the whole week, the consulants told me that there is a low battery signal coming from the alarm system, the strange thing is that there were no power outages that week in my area. We couldn't understand why the alarm was not working. They sent a technician on Saturday to check what could be the problem, on Sunday it was allegedly fixed but it is still not working, my husband armed it this morning before he went to work but when he came back from work, he realised it was not armed so he didn't have to disarm it. I am tired of not getting value for my money. I don't have faith in the system anymore, I just want to cancel my subscriptions ASAP or else I am going to the ombudsman