If I am not a member but received a gift card for there, can I go in there and spend it without becoming a member. I keep trying to call to ask but no one seems to want to answer any line I try

You have to have a membership. Unless you are just going to the pharmacy, then you don't have to have a membership !!!

Yes...you can use it without membership. But if you purchase more than what is on the card, you'll need a check, cash, or Visa card...they do not accept any other card to my knowledge.

Yes That's not true. They gave me cash back.

Yes use it like money or a credit card but you don't get any cash back you have to use it all or add the rest in cash if you go over what's on the gift card

I checked online and I believe that with the gift card you can shop in store or online without a membership.