Double check the math on the statement.I worked for a credit card company for 2 years in their support department, I can assure you that for at least some banks it is true. To be fair I should have (and meant to!) put that this was true for many credit cards, though I don't personally know if it is for all. Seems yours at least does not go by this. If they aren't doing it and the agreement says they are than there could be potential legal ramifications involved. I personally have 4 credit cards and 2 of the 4 even show the breakdown of daily interest on my statements.