Poor service

I've purchased groceries on two occasions and have been overcharged. Phoned in twice and was told that the difference would reflect in 3-5 working days. I've NEVER been reimbursed with the difference. It's happened several times last year as well. I get told that it's a pre-authorised amount that is pending but comes off your account immediately. When purchasing online it doesn't always tell you that the product is sold out. Once the payment is made an Email would be sent telling you that those items are sold out and the amount for those things are charged for. The call centre staff tells you the same story but nothing ever happens. If this has happened to anyone else out there,don't let Checkers Sixty60 get away with your money!!!!