There was an unauthorized charge on my bank account for $74.97

They charged me $131.94, on Debit card, without me giving them permission, to do so. At the end of my 6 month contract, it gives you an option, to continue, and I never gave them this permission. For the 6 months, I was a member, I was not pleased , for the last 2 months, I hardly ever got anything from other customers.