Notification of reward

Victim Location 33177

Type of a scam Sweepstakes/Lottery/Prizes

I receive a postcard, i called , they ask me for the claim number inmediatly, they ask me to pay the shipping and handling ,i gave them a prepaid visa number ,then they said ill receive within 5 or 7 days a voucher of $100 plus a trial package for vacation. I try to end the phone call by not accepting the offer cause i felt it was a scam. But then the reprentative said the payment went through . Im worry that they sent me that i will have to pay for something i didnt ask, because they have my info.my phone number , address and name. What can i do. ?

Thanks in advance