Horrible experience with ADT fidelity alarm security

I have the very bad experience with ADT fidelity. Even months after I have paid them and even cancelling their service for it was that horrible,I still get stupid messages of threats from their lawyers. I have paid for the money they requested on the 07/February/2026 for the service I did not receive,just for courtesy but now it looks like they just ignored it for stupidly threatening me that they will stupidly list me for bad paying.

Where can we also be stupid just for one day to enlist them for the horrible experience they provide to their customers? Like literally their alarm goes on untouched disturbing throughout the night always from the same time as if it is set to disturb and destroy one's sleep. I couldn't handle that and I decided to cancel it within 6 months period. What on earth would I be doing for paying for such? Next thing I was told "the alarm could be detecting the cats movements"

So I stopped paying for "their cats" only for them not to recognize my payment.