Keeps calling continuously all day--won't leave a message--I screen calls

Called my cell 12 times yesterday, 6/12/12. Spoke broken English and told me my number was picked and I could win hundreds of dollars. I told them 3 times to stop calling me and they finally did after 7pm. Thank God!

Keeps calling even though I yelled at them to quit calling. Called two times today and about 8 times yesterday.

Called and told me I was selected to receive a "shopping card" because I had recently made a purchase from  one of their "business partners" and that I could "use it at Target and things like that, ok?". They had my phone # and state, but needed my name and address so they could send it to me.  I told them that I was at work and couldn't be on the phone, and they hung up immediately.  I could hear at least 50 other people in the background doing the same thing...

Someone from this number keeps calling my Sidekick telephone. I'm hearing impaired, and only use Texting only plans. But, this person calls on my speaker phone, and it's very annoying.