this is your regular reminder to perform your good deed: make a corporation lose money because of jammed callcenters. Here's those numbers again.

Mastercard (US): +1-914 249-2000
Mastercard (Int.): +1-636-722-7111
Visa (US + Can): +1 (650) 432-3200
Visa (AUS): 1 800 125 440
PayPal: +44-0203-901-7000

Mastercard (Aus): 1800-120-113

Mastercard (US): 1-800-627-8372
Mastercard (CA): 1-800-307-7309
Mastercard (UK): 0800-96-4767