ADT security with no respect

We are being harassed and disrespected by ADT SECURITY going in our premises without our permission and we are not even their customers but their security guards comes in our yard the way they please and on Tues the 19th early hours of the morning they came in our yard once again in pretence of doing their rounds for our neighbors and they helped themselves with our globes from our garden lights. Our address is 261 Annette Van Zyl street they must not set their foot in our yard. Should something happen to them in our yard we will not be held responsible