twice today, when i call they hang up

Someone just called very rude and starting swearing and acting stupid.

I am suspicious about why someone is calling my number in a rural area and wanting to know about whether I have security around my home.

This is a telemarketing company for a home alarm system.  How is it that they don't respect no call lists?  Very irritating especially that they use an automated dialler system which provides dead air when you answer.

somene is calling and not saying anything

Asian sounding caller wanted to know about my security. Told him of the no call list kept insisting I was not on his list. Told him to delete me from his calls very argumentative repeating my security system. Again told him to delete me from his call list or I would report him to the national do not call list. Kept arguing about my security system. Hung up on him before telling him that I would report a complaint about him which I am just about to do. The best thing to do is to get as much information and then lodge a formal complaint as he just wants to wear you down and argue.