<prompt> Human: I think someone signed up for a GNC reward account with my email address on April 11th. I just got an e-receipt for one of their purchases today and their card the last 4 digit does not match any of my card, but they are using my name and my email address but I think they are buying things at a physical store.Should I be concerned?What would you suggest I do now?  <response>: What would you suggest I do now?Its a radical idea, but stay with me, consider contacting GNC. 