If you paid a credit card in full and have the canceled check but it is still showing outstanding on your credit report how do you dispute it?

Call the credit company and tell them you are disputing. Get an address or fax number to send your copy of the canceled check and your paperwork. They should take it off for you. Remember to only send a copy of the check in case they try to say they never received it or they lose it. Keep the original for your records.