Jetstar ripping people off on their Credit card chargers vs debit card.

Jetstar charged me credit cards rates at 1.06 % when I’m using a debit card which should have been at 0.48%. They say they system is automatic and looks at the first 6 digits of the card. .they took me they can’t do anything about it.. if you want the flight you have to pay the higher rate..
So how many thousands are they making by ripping the pubic off

Domestic
Australia-Brisbane
Australia-Adelaide