I went to OK Groceries to purchase electricity.

I went to OK around 18:00 on the 19/03/2015 to purchase electricity, when I got there the lady at the till told me that they don't swipe when they sell electricity. When I enquired from the Manager ***ner's son) he gave me an attitude saying that there is a sign and he showed me, I then told him that the sign is only seen by the cashier not the customer, he then told me that he can sell me the electricity and he'll charge me the 7% interest that they get charged. I left ok and to my surprise at Engen garage in Bethal, they sold me the electricity which I swiped for without any qualms. The kind of service I got there is really concerning especially coming from the owner. I don't think I will ever set my foot in that store, ever again if I do it will be out of desperation.