HELP ME PLEASE!!!!!!!!!!!?

ok, so i am not over 18, and heres what happened. I was browsing websites for like free stuff and all that like websites that offer free computers and stuff. So anyway, one of them i think brought me to a survey and when i went to it took me to a page where i gave my area code address and phone #. So when i was gonna leave the page, it asked me to stay and i accidentally hit cancel to complete the survey. Now this place has called me from 1 240 345 4103 and i answered once to see who it was. Then they said that i was entered into some sweepstakes for like a car or something and 50,000 dollars. I NEVER gave my credit card # but i think they stored my address. I told the guy i was above 18 but now im just reaaaaallllllyyyy scared of what is going to happen. I dont want to tell my parents, and i just want to find a way to make sure i can retrieve all of my personal information so this landline place can be in the past cuz i guess i won. PLEASE HELP ANYONE IF U HAVE ANY POSSIBLE WAY TO GET OUT OF THIS!!!!!!!!!