This morning I popped into Tesco to purchase some bottled water and I used the self service checkout when I had the following problem.
I used the self service checkout and when I used my Mondo card, I had a transaction notification and then an immediate refund. I tried again and had the same issue. I also had an error on the screen (see below images).
I don’t think I’ve had this issue before, but has anyone else had this and does anyone know what could cause this?