Home Makeover Systems - a sales call to sell home energy products.

This company keeps calling - does not leave a message - and when you try to call the number - you get a recorded message that no agents are available to take your call.  This is clearly a phone call trying to sell me something as they do not have the courtsey to leave a message.  So they obviously don't know me.  The company also does not identify themselves.  Again a business that is reputable leaves a message and identifies who is calling.

Rings but no one is on the line, I hung up and called the number - didn't get anything not even a ring tone!
This is not the first call I've received!

same as those above, calls me all the time. It rings, I answer and there is no response.