Here's a list of the major Visa Credit Card Issuer Customer Service Phone Numbers (For the Canadian ones):

Royal Bank/RBC Visa 1-800-769-2512

CIBC Visa 1-800-465-4653

Desjardins Visa 1-800-363-3380

TD Canada Trust Visa 1-800-983-8472

Laurentian Bank Visa 1-800-252-1846

Scotiabank/Bank of Nova Scotia Visa 1-800-387-6556