Crooked as they come

I went to Camping World located in Midway Florida right outside of Tallahassee to purchase some items for our camper. When I went to check out the guy at the counter ask me if I wanted to save 10.00 on my purchase? He stated that it was free and they were running this promotion for a limited time. All I needed to do was to answer a couple questions and sign up for Good Sam's. He stated why not it's free! He never mentioned it was a Good Sam's credit card, NEVER! I didn't know Good Sams even had a credit card! I didn't find out until I was handed a envelope at the end and he said "don't lose this cause it has your account number on it I then ask if it was a credit card and he stated that it was. I told him he never mentioned a credit card, he said Oh I'm sorry .Oh I'm NOT a happy camper!!