Double debiting account without processing order

I have tried to transact online but on checkout I got an error stating that the transaction could not be successfully completed and that I should try again HOWEVER within seconds I received sms's from my bank that the amount for the purchase was not only take off once but TWICE!!

This seems to be a regular issues looking at all the other complaints on HelloPeter, pity I didn't I have a look here first before I decided to purchase online with them!!!