My number was given out for insurance Quotes?

I have only had this number three months. I get as many as 30 phone calls a day asking for Janis They are from all over the united states. They are all insurance companies. I just now listed my number under the Do not call registry. What else can I do ? Is their an insurance registry list I can add my number to? It cost a lot to change my number but it is driving me crazy !!!!!!!!!