U.S. Bancorp Credit Card Complaint

U.S. Bancorp Credit card department,

APR or interest rate North Carolina

I need to file a formal complaint regarding my -/-/- credit card statement from US Bank. I was incorrectly charged interest of $100.00 on this statement. I had a 0 % purchase transaction balance on this card which expired in -/-/2017, which I made a payment of $8600.00 on -/-/- to fully pay off. However, US Bank applied this payment to my 0 % balance transfer balance, which does not expire until -/-/-. This is an Unfair and Deceptive Act and Practice. I am requesting that US Bank refund the interest charge of $100.00 and reinstate the 0 % rate on my balance transfer remaining balance until -/-/-. Please call me at - if you have any questions. I already tried to resolve this with US Bank by sending them a secure email while logged into my US Bank online account. However, instead of processing the complaint, they sent me the following ridiculous message : " While we look forward to being of service to you, unfortunately, we are unable to match the verification information in your request to what is listed on your account. '' Why would they be unable to verify my information when I was logged into my account to send them the complaint? This seems to me like they are just trying to AVOID processing complaints from their customers.