AT & T Universal ( Citibank ) raised my rate due to a late payment almost two years ago. I was told the new rate 28.00 % plus would last up to one year. I recently noticed the rate was still 28.00 and I called to ask why. I was told by the agent ( XXXX ) that information was " proprietary '' and he could not tell me. I told him I was going to close the account, he did not argue, did not try to keep my account (??? ) I asked him if he investigated could he tell me, I was placed on hold, he returned and he said " no. '' I closed the account today XXXX/XXXX/2016 as my other credit cards are half that rate ( or less ) and I have a credit score over XXXX! I would hope the rate they are charging and the " proprietary '' reason can be investigated. As a consumer I believe I 'm entitled to know why I 'm being charged 28.00 % when I have good credit. 
