U.S. Bancorp Credit Card Complaint

U.S. Bancorp Credit card department,

Payoff process Arizona

Used credit card to make purchases. Paid full amount of purchases before end of billing cycle also paid minimum monthly due in addition to paying off new purchases. They applied my minimum monthly payment to zero interest balance. Said they applied above and beyond payment of minimum amount to new purchases. Yet 2 months in a row they charged me interest on purchase 's that had been payed in full and then some. Example I made $440.00 dollars in purchases and paid $550.00 which included the $55.00 minimum payment. Yet the show I have balance with interest of 17.99 % in amount of new purchases accumlated on card. They claim over and above minimum goes to pay the higher interest rate on new purchases yet instead increase the balance at 17.99 % which should be -.