Bad service

I went there yesterday evening at about 18:00 asked the attendant to pour R200 95 and check my front Tyre pressure. I was distracted by a phone beeping and attended to it and only realized when I was about to reach my destination that the petrol did not go up.Went back before I went home and complained about it and i was only referred to a Guy called Peter who is the manager of the garage He couldn't help me either. Instead he was telling me how their system is accurate and i kept asking if it is accurate as you say why are we in this position. He told me this is the first time such has happened there but clearly not.