I have a business credit card through Citibank, a Citibusiness AAdvantage Platinum Select Card. My last statement balance was {$750.00}, and I paid {$700.00} on the due date of XXXX/XXXX/15 ( no disagreement on payment due date or date received ). I was charged interest on XXXX/XXXX/15, in other words 10 days after payment, on the month 's average daily balance, rather than the unpaid balance of {$50.00}. And almost exactly the same situation occurred last month ( with a similar charge ). 

This {$11.00} charge is in addition to the {$100.00} annual fee I pay, and the ~2 % fee paid by merchants. All other credit cards I have charge interest on an unpaid balance ( not the average daily balance across the whole month ), and I find this practice of Citibank 's to be i ) an unusual, illogical, and frankly, greedy attempt to create fees and ii ) unfortunately in keeping with Citibank 's reputation of aggressive and opportunistic ( fees ) behavior. 
