I had a credit card issued by Citi. According to Citi statement for the billing period XXXX/XXXX/2015 XX/XX/2015, they received my last payment ( {$4600.00} ) on XXXX/XXXX/2015. This was the total unpaid balance on my account on the day I paid. The statement for the billing period showed an unpaid balance of {$51.00}. After receiving this statement, I called Citi to close my account. I requested the person ( a female ) who closed my account to send me a letter explaining how they come up with {$51.00}. She told me that she can cancel this {$51.00} if I keep the account rather than closing it. I told her that I do not need this account anymore and willing to pay the amount. My only curiosity was to find out how they came up with {$51.00} while they received my full account balance of {$4600.00} on XXXX/XXXX/2015. She agreed to do that. While I am waiting a letter from Citi, I received a Citi statement in my email. To my surprise, this time the amount is {$77.00} ( {$25.00} penalty for not paying on time ). So I called Citi again. I again placed the same request as before to the person I talked to ( a male ). He agreed with me that he will send what I requested. Today, XXXX/XXXX/2015 I received by mail nothing but normal monthly statements ( past three months ) that are accessible to me online. I am pretty sure, they will send another statement claiming an unpaid amount of at least {$100.00}. I believe, as a borrower, I have the right to know how interests are calculated. Now it seems that Citi people, for some reason, do n't want to do that. 
