U.S. Bancorp Credit Card Complaint

U.S. Bancorp Credit card department,

APR or interest rate Washington

I signed up for an 18 month duration US Bank interest free credit card, Acct - :. zero % interest rate on purchases if minimum fee ( 1 % ) paid within 30 days I paid the 1 % minimum fee -/-/-. The -/-/- bill says " failed to pay the minimum fee '' and asserted the billing cycle was 29 days not 30, declared me in default of my 1 % minimum ; credited my minimum fee to -/-/- bill, and charge 15 % interest and $39.00 " fees '' and have charged me interest ever since. This is just plain fiction. I want it reversed