Misleading Advertising

Checkers Advertised a special on wine that offers a discount of 20% on ANY 6 wines - however when it came to payment I first had to point it out to the cashier, then the cashier had to call on a supervisor who informed that one of the wines was not part of the offer. He then told me that only the wines in the illustration of the brochure is part of the offer. Nowhere in the advert or at the wine shelves are any exclusions specified. So ANY 6 wines does not actually mean ANY as I understand it, can Checkers please explain to me what the term ANY means at Checkers ?