Kept waiting for ages for a price & no response

I chose a cap for my child and it had no price tag. So the staff tried looking for it on the system. To no avail. Then another staff member brings out 3 more caps none are the one I chose. So I had to buy one I did not choose initially because they couldn't find a price. It's disappointing. I know the cashier apologised but I was kept waiting for ages and had to buy a product that was not what I chose.