Yeh!!
I have noticed it too many times. Infact, I wrote once to Carrefour when I experienced a similar situation, but they never responded. Especially these days U dont find price tag on each product. When u ask from the sales assistant he/she utters a price & when U went to pay its completely different price.
But when I cheeked with municipality (baladiya) they said that it is a must each & every product should carry a price tag. which never happens with most of these super/hyper markets. next time when U experince some thing like this call this number 800888 consumer complain hot line with a proof. they can take action against these gready owners..

It is cheating & misleading shoppers.