Double Debiting

This is the second time Woolworths has double debited me for an order placed. The first time it was a "glitch" in the system. Second time around its apparently "withholding of money for potential difference in pricing" firstly do not going online if your systems can not handle it, secondly taking money from an account a week or two after initial purchase which was paid is *********. How can you brand yourself a premium store as well as charge premium prices when you are making rookie mistakes. If your customers do not review their bank statements you would be making more money and keeping quiet. I have to call you guys to arrange for my money to be returned. Orders over 1k are being double debited?? Please sort the way you do business before the entire franchise collapses even further than its current state.