Misleading advertising by Makro

Makro advertised JC LE ROUX sparkling wines at a price of R390 for 6 (750ml). This equates to about R65 for a 750ml bottle. As Mother's day was approaching, I intended to spoil my wife and my mother-in-law by buying them 3 bottles each over the weekend. So I took 6 bottles of JC LE ROUX at the advertised price if R390. To my surprise, when the cashier punched a price of R85 per bottle, which was contrary to the advertised price. She insisted that this price (R65/750ml bottle) refers to a "case", and this is clearly NOT CORRECT (based on the advert). After some haggling and an unpleasant exchanges with the unreceptive cashier, I decided to ditch the sparkling wines. Surely, this retailer should explain their pricing model to their ill-informed staff members, as this is tantamount to misleading advertising. It would be interesting to hear what Makro would say about this debacle.