Unacceptable way of handling customer

I was over-charged on some body lotions. The price on the shelf was less than what I was charged. Everyone who assisted me, were incredibly resilient in reimbursing me. If your shelf says a body lotion costs R33,95 and then my slip says I was charged R46,55, this is a more than valid reason to be reimbursed the balance. The managers questioned me and initially told me they could not help me because prices change sporadically (really?) and that coming back 5 days later is waaaay to late?! I was made to feel like I was being dishonest. The manager kept repeating how in future I must be aware of my slip?!? I'm sorry, are you seriously reprimanding a customer? I run retail stores and we make sure we stick by \the customer is always right"policy in order to please them. My experience was so unpleasant I might just stop going to clicks completely and spread the word of their bad service and attitude.<br> On top of it all"