BP Express Atterbury losing customers due to faulty machines

I bought a voucher on the Vodapay app to get the offer of 10% more fuel at R200 then you get R220's worth of fuel. I paid with a Vodapay voucher before and didn't have any issues, however when I got to BP Express Atterbury Value Mart today I waited for about 15 minutes just to pay with the voucher. The machine was giving issues AGAIN! Every time that I get there it is an issue to pay, with a voucher or just through normal payment. And there is only one machine that can process the Vodapay voucher and even the Smart Shopper cards. How is this possible??? I eventually paid normally, meaning I spent R420 where I would have only spent R200! I want to be reimbursed for the money I lost, and because I drove to BP to get the voucher value! Pathetic is not the word.