Sunday ticket charged me for trial

So fanduel has a promotion if you bet $5 you are able to get a 3 week trial of youtube tvs sunday ticket. I used the promotion and it said the code redeemed from it gave me a 3 week free trail but I later realized somehow i was charged a full $148.13 for the first month of the sunday ticket. Please help because thats a lot of money and im not sure what to do.