Woolworths has ****** me

I placed an order of the 6*200ml juice online on the 20th of September of which 2 of them were R32. I ordered 6 of them. 2 were another flavour and 4 were a different flavour. The total was R96. Now apparently the flavour of the 4 packs was out of stock and they substituted with another flavour. To my surprise now they debit R207 instead of R96. When I called to enquire they told me that if ever there is a substitution the promotional price falls off and I get charged the normal price. I was told that it is on the terms and conditions. So When I read the terms and conditions there is nothing of that sort. I want my money back.