Unfortunately for me, same story. I have a long standing history with Citi, 10 years plus.
All Citi Flex Lines were closed by Citi which is fine, I do not have a problem with that. However, once closed I never got a statement. I called 2 days after my payment was due to inquire in Feb 2010. Immediately made the payment and they sent me a new statement which included a $49.00 late fee and an interest rate hike from 7.24% to 29.99%.
I wrote a letter kindly asking that they fix the mistake. I received a letter back stating that there is nothing they can do and that interest rates cannot be adjusted on closed accounts.
Unfortunately I feel that they are intentionally exercising these tactics especially after reading so many similar stories. I have filed a complaint with the Federal Reserve and can only hope that someone puts a stop this.