wakanet.com wakanetwork.com got a call said won gas card and wal-mart 100.00 ea cost 2.99 only now didn't get it and can't cancel they will take out 39.99 from my account every mo how do i stop this , Internet

i rec. a call from wakanetwork.com today and said that i won a $100.00 gas card and a $100.00 wal-mart card and the only thing that is required of me is to pay $2.99 and nothing more and the print for the prizes would be printed in my email.  She claimed that all the information would be in my email if i would want to cancel the coupons offered and i could cancel at anytime or if i decided to keep it i would be paying 39.99 as a direct deposit from my account.  I went to work and when i came back home i looked at my incoming emails and found nothing from that website.  i personally went on the email to see how to cancel the offer and found nothing from that website but they did take out the 2.99 which is ok by me but it is not ok to be taking out the 39.99 without my permission when i was left with nothing in my email.  please help i do not want any money taken out each month.