Advanta Credit Card Raising interest rates for no reason other than to line their pockets!! Wilmington Delaware

I received a letter from Advanta today regarding my old account.  I transferred my balance to another card when they raised my rate for no reason to 30+%.  The letter writes:
The enclosed check in the amount of $105.19 is a reimbursement relating to certain changes in terms that resulted in an increased interest rate on your Advanta Business Card account between June 1, 2007 and December 31, 2008.  Please cash this check as soon as possible.  It will be void after 180 days.

The FDIC is the primary federal regulator of Advanta Bank Corp..  The FDIC has determi ned  that the repricing events may have constituted an unfair practice under section 5 of the Federal Trade Commision Act.  The bank disputes this, but it has entered into a Consent agreement with the FDIC as part of a settlement with the FDIC in connection with their determination regarding the repricing Events.

The amount of your reimbursement check equals the difference between (a) the full amount of interest that accrued on your account from the effective date of the repricing event.

Upon accepting and cashing the enclosed check, you agree to release Advanta Bank Corp. and its parent and subsidiaries from any and all claims or actions that might exist or might have existed on the date of this letter that involve and reprice event.
End letter...