The smart shopper savings Scammers Telephone, Internet

Well, i got a call from smart shopper savings that i won a $50 voucher, so they needed my address and suddenly he is asking for my credit card/visa card info because i need to pay 3.95 for the activation of the card.. And he tranferred me to another representative and again this girl said that i have to pay $66 for a 16 months supply of their magazine. She and he gave me a 100% guarantee that i can cancel anytime and get my money back., so gave them my info. After that call i realized that i just gave my personal info to those people, so i tried calling them back wishing that i can cancel everything but the number they gave me isn't working, but luckily they called me again, and they were not expecting me, and keep on saying " oh hi ms.-----, sorry wrong number have a good day" then i said hey wait i want to cancel everything, from the 3.95 to that 66.00, and he said that he can,t do anything, that i need to call the number he gave me, i told him that number isn't working, just cancel everything. But he keep on insisting that i need to call their customer service at that number, and he told me that im not understanding him. Then he hang up on me.