24-hour customer service

A dedicated Diners Club® Customer Service team that understands your business travel needs is on call 24 hours a day. Your Personal Representative can answer questions or assist you with special problems regarding your account. If needed, your Representative will investigate all matters thoroughly, obtain support documentation, monitor the situation, make phone calls and do whatever is required to resolve account issues quickly. To speak with a Customer Service Representative, call toll-free in Canada & the U.S. at 1 800 363 3333. Elsewhere, call collect at (416) 369 6313.