Disgusting service

I am ****ed off at the service received from pick n pay protea glen yesterday. I bought a 2kg sky auto washing powder which was priced as r38.99 however when I got to the till the price scanned at r47.99 when I told that girl that was assisting me that the item scanned a different price to that at the shelf she insisted with a dismissing face that it minused ,I took her word for it as I was in a hurry. When I got time to relax I looked at the slip and the item did not minus.I feel very disrespected as a customer 😤 we work hard for this money for someone to joke with it.I want my refund of the difference that was overcharged and now I will also demand the double the difference. This thing could have been easily attended to had that girl listed to me 😡😡😡😡