Also got a call from 2134572100 half an hour after booking a ticket with United. The caller, who had an accent, perhaps Indian, said she was calling from United and asked details about my credit card as a "verbal check". After I got off the phone the number rang back- I didn't pick up. I got no more calls from this number.
The next day I rang United and the customer service person said did not make calls of this nature. I'm monitoring my card.
I have received several calls from this number but no message has been left. I just wanted to let people know I reported this and I did NOT order any airlines tickets.
Booked for a staff member on my credit card. They called to confirm I booked a flight for them. assuming they called because the flight name didnt match my credit card number.
As soon as I confirmed that "yes I did book that flight" the caller said "thank you" and hung up.
Didnt ask for any personal information.