Wrong amount charged on my card

Game Mall@ reds. I went in to buy a gift bag from the store . It was marked on the shelf as R14.99. I got to the till told me it was R40. I explained it was marked as R14.99. the manager came along and said it is R20. I then said ok. ( I had my toddler son with me that was being difficult). I got to the car an saw the bag was torn. So I sold a bag that was torn on the inside. I was in a rush and left. When I checked my receipt once home. I noticed they charged me R40.

This is very sneaky , disgusting dishonest behaviour