Robbing customers

This morning (15 Feb 2018) I went into the Engen Quickshop at Welcome Service Station, Sherwood, Durban. The bakery did not have prices on their items. When I asked the assistant why this was, all she could say was that those were "outside items" and not theirs. So, basically, customers must take the items and get surprised at the tills? My purchase came to R24,90, and the teller (Lindo) did not give me the 10c as part of my change. Is this Engen policy not to display prices, and not to give 10c change??? I wanted to speak to a manager but was informed that there was no manager present. Terrible.