.....To show our appreciation for using your Shell Credit Card, ..... (I don't have a Shell card, I'm confused) I've been specially selected to receive the invitation to upgrade to a shell mastercard. Credit limit up to $15k, 9.9% for bt. I've never had a shell gas card so is this a scam or just another way for shell to pull my credit report and then deny me. I really don't think I qualify for this. My score hasn't reached 600 yet.