Maybe it's different in your country, but in the UK if you pay on credit card and the supplier fails to deliver your credit card company has to refund you, it's then upto the credit card company to get their money back from the supplier.
In the case of debit cards you don't have any of that protection, so if you want to get your money back you have to get it back from the supplier (which if they've gone bankrupt/disappeared is near impossible for an individual).
In the case of debit cards you don't have any of that protection, so if you want to get your money back you have to get it back from the supplier (which if they've gone bankrupt/disappeared is near impossible for an individual).