go shop and save free gift card hoax Maitland florida

i was contacting my car dealiership when someone answered the call telling me that I had won a 100 dollar free gift card.  they made it sound as though it was attached to the car dealership and it was sm y lucky day and my lucky call. They requested my crediat card number for the activation fee. When I questioned that the Indian man said that i should not worry this wasa gift that i could use and not attached to any other services.   I fell for it and gave them my credit carrd number.  

They then mentioned something about shope and save and I requested to cancel my free card and end the call.  They would not give me my money back and kept asking to give me a confirmation number. I refused.  I ended them call/ They attempted to contact me mutiple time.s  I rec'd a letter today telling me I was registered for thier site. No Gift card.   And the site just takes me to other credit cards that I have to pay for.   Really stupid on my part. I cannot get through on any phone number on site.