I ordered concert tickets 3 month prior to this phone call. Kathy at 402-991-8774 said my concert tickets were sold by the 'seller', but she can offer me 4 closer seats for additional charge?!  

I would like to know, is this a valid company and how do they know my info? Would they have my credit card number as well!?!?! I am very worried if this is a scam or not.  

How do I confirm this is valid or not?

Which Better Business Bureau do I call? Contact Info please.
Thanks so much.