The NZ Commerce Commission has taken just about all the local banks to court for exactly the same thing,getting over $NZ24Million back for NZ Credit Card users.

See http://www.comcom.govt.nz/FairTrading/creditcardusersgetover24mback.aspx
Without even reading the originating data, here is a summary:
You get a coupon or a few dollars if you are one of the wronged parties.
You get wheel barrows full of money if you were one of the lawyers.
I got the letter yesterday, getting $25 for spending a few bucks!
The NZ Commerce Commission has taken just about all the local banks to court for exactly the same thing,getting over $NZ24Million back for NZ Credit Card users.

See http://www.comcom.govt.nz/FairTrading/creditcardusersgetover24mback.aspx
Without even reading the originating data, here is a summary:
You get a coupon or a few dollars if you are one of the wronged parties.
You get wheel barrows full of money if you were one of the lawyers.