Peter,
It sounds like your card may have been 'skimmed' somewhere ... producing a card with the same magnetic strip and recording your PIN they can conduct transactions at all sorts of places.
BIGW can be a target to this as they have the auto checkouts in most stores now - so nobody notices a non standard looking cards - just that the payment has been approved and you walk off with the goods.
Good advise to check ATM's etc for strange looking hang on devices and hidden cameras - i've spotted a couple in metro melbourne previously.
Jamie
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