bad service

I am very disgusted on the service I got on the 28.06.2018 at the Stellenbosch branch. they have a R25.00 special and the 7kg potatoes is included in the special. I have spoken to the manager Cheron, who arrogantly said that the special at her store does not include the potatoes and she is not willing to give it to me for that price. no where on the promotion does it include the branches and the service received is not of good standing