******** advertising- "buy any 2 get cheapest free" its a lie

The was a special at cherckers writen "Buy any 2 get cheapest free". This is false advertising and ******* as one would think is a bargain. You could only get the cheapest free if you get the 3rd one. I asked the line manager why isn't it displayed on the advert. Also I wanted the 2litre sizes but she didn't allow me she said I must take a smaller size, when I asked why is the sticker on all the savlon sizes she asked the assistant to take them out and couldn't give me reason. I had taken picture on the orange sticker to show. Its a disgraceful thing to because this is *******. I chosed to buy there because of the special otherwise I would have gone to other shops.