Slow service and bad feedback

This is the third time i get slow service from this filling station, both north bound and south bound seem to be the same. Today, at around 19:10 I stopped to fill up. I am a big fan of BP and believe that this location is very convenient. I expect to quickly stop and fill up without feeling like I interrupted my trip. The station is generally not busy, now I understand why. But what irritates me is that after waiting there seems to be no system to keep track of which car arrived first, the attendants just serve whichever car they want. After waiting for more than ten minutes and seeing two cars that arrived after me being serviced I decided to start my car and leave. One attendant stopped me, which I did. I explained to him that they need to track which car arrived first as this is not the first time I wait for long and have other cars being serviced before me. He told me I mustn't waste time with complaints and explanations. I explained to him that they need to look into that. By this time he had already opened my tank, because if he thinks my pointing out that there is a gap in their service system is a waste of his time,then maybe filling up at their station is a waste of mine