When my credit card for my account with them expired, I decided not to renew my contract which I had had for 13 years - so any of their hardware had been paid for many times over. The original contract was about 3 yrs. When I cancelled by phone, they continues to dun me with bills. When I called again, she found that I had called and cancelled in my file , but "Oh you have to write to us". I wrote, I emailed. Still the bills came.
Finally, I received a call from a woman who said that I could not cancel without paying for a year's worth of service which would be end in September of 2015. This made no sense to me. Then she said that if I found someone else to take over my account, they would waive those charges. I told her to get a lawyer, that I was not paying.
They also told me in all three calls that I would then have no fire alarms I checked ith my local fire department and found that also not true.
These people play hard ball. I would not deal with them again.