Same thing happened to me. The problem is that I'm going overseas on Friday and, as always, use the Wizard card for drawing cash.
I have just called the Service Centre. This is the deal: New cards, with different numbers, are in the process of being mailed to all existing card holders. When you receive the new card you will need to call the Service Centre to activate that card. At that point, your balance, transactions etc. will be transferred from the old to the new card and your old card will be deactivated.
If you don't activate your new card, you can continue using the old card till 30 December at which point it will be de-activated.
If you are already out of the country and only returning after 30 December, I guess you could have a problem.
Regarding using the card as a "Debit Card" - I've never had a problem. I always put the card in Debit before I go and then draw cash while overseas. No fees at all. Maybe the trick is to keep the Debit balance under (say) $5,000. If it goes higher, it could trigger some automatic alerts. I also do make the occasional purchase with the card. Am happy for Wizard to make the commission on the card (without having to pay for points) - its a great deal for consumers and I don't want Wizard to change the rules/conditions!
I'll update this thread if I have a problem with the card while away.