missleading customers

Hello, I shopped at the Phoenix Pick n Pay today n 1 of the items on promotion was 750g Ricoffy coffee for R58.90 however the only coffee on that shelf was the Decaf so I assumed that, that was the coffee on special. When at the till, it scanned the coffee at R90.00, when I queried, the store manager named Randy advised me that the decaf coffee is not the one on promotion. Now the price poster on the shelf only stated 750g Ricoffy coffee R58.90 with no exclusions stated. As per the manager he could not give me the coffee for that price as it will be a loss at the same time I purchased 2 colgate toothpaste which was advertised at R9.90 however I was charged R12.90, I brought it to their attention same time, the manager gave it to me for R9.90 and advised about the pick n pay policy in a case like this but only get the discount once cashed up n left the store. Now I dont see the point whereby it got to cost me more on transport going back to the store for their policy to come into effect. I feel that I was just brushed off by this *********** so called store manager Randy cos' even the cashiers at the till advised that I should have been given the products and the discount.