National Do not Call, Registry -- Is a Sector from your favorite government agency, the FTC!
If you get calls saying you constantly won something; if you get calls from anyone other then someone you know -- Register there and it will stop the calls. If the harassing continues--the FTC will hunt down and penalize the idiots.
Once Registered, there will not be any confirmation call. If anyone calls you saying they are from the site, contact https://donotcall.gov/ Immediately!