Citibank Credit Card Complaint

Citibank Credit card department,

Sale of account Illinois

There is an unknown Citibank account that is on my credit report that was sold to - - that I never opened and have no knowledge of, and I can not get deleted. I do not know the account number, the balance, who to dispute to, when it was opened, sold, transferred, charged off, payment history, dispute history, letters of collection, rights or terms and conditions, it is a complete and total mystery and I dispute in totality anything relating to this account. The account can not be validated per the FDCPA and the complete information I am looking to validate to take the proper action if I need to do that. I do not know who to contact or what to ask. Citibank directly needs to furnish all of this information to me since they are claiming the account as original creditor.