Help! a hacker has added me in facebook, and i cant delete them, report them or block them?

i stupidly confirmed a request to add, because they had mutual friends, and because i play pet society, people are always adding their friends friends when they see pics of trades they want in on etc... so anyway, as soon asi accepted, i went to their page, and its blocked to me, they told me theyre a hacker and i tried to go to edit friends, but when i click the x next to their name it wont work! i cant delete them or block them and theyre still sending me messages and commenting on all my statuses