Unprofessional service

I always go to Astron energy Sunward park (Gauteng) for the rewards and every time I have to use the rewards the machine is not working but this only if I am being helped by one lady, funny enough when I go to the attendant on the forecourt, I always get assistance in putting my number on the machine and i am not sure whether she doesn’t know how to use the machine or she is lazy to do her work. If it’s the machine that is not working clearly this rewards thing is not working, you should just cancel it.