Carrefour will refund 10 times difference???

In Carrefour there is advertisement if u will find any item cheaper in other store, they will refund 10 times difference. I got from LULU Hypermarket same item with the same barcode as I have bought it from Carrefour. I present both receipts for customer service to get the 10 times difference. As the stuff has not enough information and doesn't listen to the customer requirement, they guide us to refund the item and then they said the rule of the 10 times difference is not applicable because the item has been refunded. A complaint was written, next day an employee has called to explain the rules. In the mean time, their aim was to extend time to change the price of the same item. After our complain and within less than 24 hours the price was reduced and the same item now in Carrefour costs 2 riyals less than LULU. Now the rules of advertisement cannot be applicable on our case. It was restricted our, as consumers, rights and the legitimate expectations.
Carrefour making advertisement, making rules but never follow them and they don't respect their customers. I can assure that our family and our friends will never shop again in Carrefour.