Why is there no real 7 day Free trial?

I downloaded the mobile up and after one use it ask me to sign up and subscribe for a free 7 day trial and after a 47.99 or so charge would be made. Or to subscribe for a month for 12.99 but when I tried using the 7 day free trial it kept denying the subscription come to find out my debit cards were being charge when trying to subscribe and not 7 days after.....