JPMorgan Chase & Co. Credit Card Complaint

JPMorgan Chase & Co. Credit card department,

Billing disputes California

I paid my Chase Amazon credit card in total on - - and they charged me interest -. I called and asked for them to drop the interest charge since the credit card bill was paid in full and I have - credit cards with Chase. They refused - how are customers supposed to feel they are financial paid off if the credit card companies continue to bill them interest. I have not used that card since I paid if off