Citibank Credit Card Complaint

Citibank Credit card department,

Credit line increase/decrease Florida

I am attaching a statement, but the short version is Citibank denied my credit increase based on an exisiting Payment Arrangement program - that they say I am enrolled in. However, they have no proof of that, and in fact - of the staff that I spoke with agreed that I am not in any program and that my card is in good standing. After speaking with different staff at Citibank - I was told that " I must have had a debt charged off with Citibank, sometime in the past 36 months. '' However, they have no information about this, no dates, no amounts, nothing and they also will not provide me this in writing.