i've read most of the reports that were filed here and i would like to offer some advice as these are the steps i am now taking.
first you need to send a letter to them asking them to cease and desist calling you at your place of employment (get it notarized, keep a copy, and send it to them via certified mail. then file a complaint with the attorney general's office in your state as well as file a complaint in their state at the attorney general's office (512-463-2070).
Then call the Dept of Banking and Finance for your state to report them as well. To call someone 10-15 times in one day is too much. After that to call and say you have won a sweepstakes is a bit too much--no i did not fall for it. So legally, this is what i'm told can be done.