Selling a Blend wine at the Pinotage price

Mimmos in Lynnwood road, tried to sell me Kanonkop Kadette Cape Blend (not on the wine list) as Kanonkop Kadette Pinotage(listed). I know that the difference in retail price for both these wines and the Pinotage is R20 to R30 more expensive than the Blend. Then Mimmos tried to force me to pay the full Pinotage price for the cheaper Blend wine. No discount offered or apology. The service is just poor and I am sad to say that I will no longer stand for their mediocre attempts of service and quality.