Citibank Credit Card Complaint

Citibank Credit card department,

California

citi changed the terms of my credit card account to paperless without users agreement.my credit score and interest rate were affected.after having reported a disputed charge i was told i would have to create an online citi account.im now being told by citi that i somehow checked a paperless payment box which i know i didnt.ive been trying since -/-/- to get an explanation in writing.after being a customer since -/-/- im canceling my account with citi.