Price difference !

I visit Bethlehem Clicks pharmacy a lady assisted me with my prescription while I was there I requested also Vitamin B tablets, she informed me that the medical aid will not pay it, no problem with that since I saw the shelf price of R19.60, she informed me the price is now R27.50. I informed her the price on the shelf is R19.60 and that they van now charge me the higher price. She informed me that the price went up yesterday and I must pay it! She even discussed it with her colleague he just rep**** she must pay the price on the system!