Extreme Acai Berry this is a ripoff St, Bay 711 Florida

I ordered a free 14-day trial and agreed to pay shipping and handling ($3.95). When I received the trial package after 10 days I read the small paper that was enclosed that I will be charged an additional $89.31 every month if I did not cancel after the trial of 14 days that includes the 10 days of shipping, so I kept trying to call them all day the line was busy finally after 4 pm the phone was anwsered but they kept me waiting for 15 min and still waiting, also there is no email address to contact them. how can I stop them from charging me.

Nana
anaheim, California
U.S.A.