because they call around 7-7:30 in the morning.
But there are things you can do such as registering your number on the gov't Do Not Call list, just Google it.
Plus you can arrange it so nobody can call your number that doesn't have the secret code.

every night and many times during the day when I am involved in something.

Mine is from a chinese food restaurant.
A recorded message..
Not sure what they are saying, but I hear the word "chow mein" and it makes me hungery every dam time.
I tried calling back to order some food but
you cant even reach them.
So Bloody Rude:)