The credit folks over at Citi Cards can be contacted at 800-763-9795. If you wish to reach the credit card company about your aproval status use the 800-645-7240, 800-288-4653, or 800-750-7453.
American Airlines cardholders can use the 888-662-7759.
If you wish to cancel your services at Citi Cards use the 800-444-2568 and this will get you with retention.
Citi Business Card Applicants may use this number for inquiries 866-606-2961.
If you have a Credit Bureau Dispute use this Fax 866-713-5028.