USN Nutrition Store That Doesn't Take Cash

I discovered something that I think it unfair to me and other clients. Recently the gym has partner up with USN to sell sports nutrition supplements. I was so excited as I thought we wouldn't drive all the way to Crome Rosebank to buy some gym supplements. One Saturday morning I went in for the first time since the store was opened. I was looking for a USN pre-workout tube (Pre2). The retail price for that is around R15 but I was turned back because they don't take cash. Firstly beside that cash is also considered as the most used option as means of payments. This means I need to swipe my bank card for R15 item even though I have it right in my pocket? Are you guys saying if you are a man on the street without a bank card, you can't buy USN products? The Salesman in-store said it's in planet fitness very proudly... Yes, I agree thats a rule but why in the gym nutrition store. All the stores which were there before took cash. So tell us guys.. whats so special about this one. I will understand if this rule applies in the gym payments ect... Not in the store. If this doesn't change... Well good luck on footcount and the success your store aswell. Believe you me when I say I've seen them falling on that spot and you must be heading for failure as well. Deneing clients to buy USN products cos they have cash with them. So I should get bank charges for purchasing R15 item. Remember not all of us have platinum cards.