Citibank Credit Card Complaint

Citibank Credit card department,

Credit line increase/decrease Virginia

On -/-/-, I opened my e-mail from my citi cards account to be informed that the line of credit on my account was being reduced from $24000.00 to $21000.00 and the stated reason was that I had big balances on other bank credit card accounts. I have had the citi card since -/-/-, and with the exception of -/-/-, I have paid my account in full or in an amount exceeding the minimum payment each month before the due date. Last month I was visiting friends in the Florida - when I mailed my citi card payment on -/-/-, but the payment was not credited to my account until -/-/-.