The General Store Port Elizabeth

Went in on the 12th of May to purchase 3 canisters that my daughter and I saw the day prior. At the check-out point as the items were being scanned, we noticed that 2 canisters were priced the same and yet they were different sizes. Upon enquiring as to why this is so, the cashier then just takes out the cannister from the box and scans the item using the barcode on the cannister itself. To my disbelieve it was then scanned R55 more. I told the cashier that I should get the item as was advertised on the shelf and scanned originally. She calls upon her so called Supervisor Tanya, of whom I must say from the onset has no Customer Service at all. She sees the error, refuses to honor the price it originally scanned for, and then has the audacity to tell me as the Customer to either take it at the 500% mark up price or leave it. I told her that it was no way for her to speak to a Customer, and that in fact she should thank me also by highlighting the fact they they themselves are *********** if they can't label goods at the correct price. What is so apparent now is the fact that all the cannisters of that size had the same bar code and the price label on the shelf held the same as well. This clearly indicates that they are indeed making a 500% markup on their goods. To be given such atrocious service culminated by being cheated leaves me no other choice other than to never shop there and also make the public aware that a store run such as that does not deserve our support.