I have my credit report from all 3 places and have a credit card on there.

On two reports it shows the account number, etc. but on the other report it is listed as a different account with letters in front of them. So overall it looks like I have two accounts over all 3 reports.

Can I fix that and who would I write the credit report company or the credit card company?

That is not duplicate listing as long as is on different reports, what it is? A good account or a collection?