Ordered declined, but money taken

Not once, but now TWICE, I have placed an order with MR D, for KFC on Sandown Road in Parklands, and then KFC does not accept my order, yet, my money has come off my account. I must then RE-ORDER, from another restaurant, costing me double what one has planned for an evening of take out, and then wait up to 5 days for my money to be returned to me. If this was a once off, I would understand, but second time now... then, when I explain this, the call centre lady can only say "I am sorry about that".... Is this a **** to get interest by keeping the money for days before returning it?