Bad service from Attendant and Supervisor

After the service i received from Engen i will most probably never go back! <br> I went to fill up tank yesterday as i always do on a sunday then i know im set for the week - however my tank was not empty it was about half so i expected to pay around 250 as a full tank cost be just under 500. I asked the attendant Mike to fill it up and i payed 238 so that is right? No when i switched my car on that gage only showed it was filled 3/4 of the way so as it sometimes takes a few min to lift i left it i left the service station and turned into the shopping center right next to it where it still didnt lift and i turned around and went back to the station. just get the rudest service ever. I asked the cashier i would like to speak to the supervisor/manager which i was then told that he is not available as he is not there.... then i asked to get numbers so i could phone someone higher up because i paid to have my tank filled but it wasnt then all of a sudden the supervisor appeared then he said what is he suppose to do ? the service at this station was absolutely horrifying! the attitude of both attendant and superviser were absolutely horrifying. That is a good example of BAD service