Woolworths cant honor their word

I am most upset. Yesterday I saw that Woolworths advertised a 6 pack juice @R12.99. I ordered and received 2 packs. So i went on again and ordered 12 more packs. This morning I received 12 individual juices. In effect I paid R200 for 2 packs or juice which is madness. If an error was made on tehir side they should still honor their item and price because that is what I bought and at teh price they advertised. The pictures will even show it is a 6 pack and not individuals.