If it's too late to cancel the transaction thru your bank/credit card company, then contact them anyway & inform them this is a scam site & that you want to prevent any future possible chance of them re-charging you. Some scam sites do charge monthly or yearly. Most banks/credit co.'s do have some type of special dept. dealing with these matters. So if you've reported them there will be a record & hopefully they can do as you request. Another point would be to go back to the original site & see if there is a cancel membership option. Generally this would be found under support or membership pages. It will most likely be in very fine print.