False advertising and bad treatment of client

I bought a 5lt Home Ice cream Strawberry) Ice cream as it was advertised for R89. At the till it scanned for R108. When i queried it the till lady called a supervisor . This supervisor made me feel like a idiot saying it is the 2 x2lt that is R89. Yesterday i went pass there again and the sign definitely say R89 for a 5lt Home ice cream. (it tastes like R50) But the stupid attitude i got will make me never return again.