They have spotted that they are also paying more interest than new Mint customers.

BBC: NEWS | Programmes | Moneybox | Double Mint offer exposed

Meanwhile, some Money Box listeners who have held an RBS Advanta card, which has been converted into the new Mint brand, are also angry.

BBC: NEWS | Programmes | Moneybox | Double Mint offer exposed

Chris Kirkness, vice president of U.S. operations for the New Zealand mint, declined to discuss sales, but said the mint had been discussing other projects with PFGBest.

WSJ: Peregrine's Vast Money Trail