Air Tickets Pretended to be Expedia; claimed additional payment necessary to hold seat. New York NY

Called Expedia customer service concerning Alaska airline ticket that had already been purchased for $351, but could not check in on-line. Person answering phone (from India) said I had a stand-by ticket, which was not true, and that I would have to pay an additional $396 to be guaranteed a seat. 

I did so because it was an emergency.  I did not receive any confirmation of this change.  Credit card charge did not come from Expedia, but from "Air Tickets." Two phone numbers listed were (1) for a person in North Carolina; and (2) no longer in service.  There was no web site or other information about this "company."  Alleged agent gave phone number, which Expedia never does. 

Expedia had no record of this phone call or additional charge.