I just went through my bills this past weekend and read through the privacy fine print. I was naively amazed that there were several that shared information to 3rd parties unless you chose to opt out. I spent about half an hour yesterday calling and going online to limit the sharing.
I really have no idea if it will help, but if I can cut down on a few stupid calls, it was worth it.
Ring Ring Ring
"Hello?"
"We see that you're interested in personal security since you opted out of sharing data. We'd like to talk to you about a special offer we have on our new enhanced security suite....."