Something not right with BP Lenasia South

Hi, I would just like to take this opportunity to advise regarding the service Received at the BP garage in lenasia south ext 2 next to DMC. I feel that they are robbing people when they fill up petrol as when I filled R100 the fuel tank petrol never moved and when I brought this to the managers attention he advised that there is something wrong with my car and also said that I must disconnect the terminals and connect it again then only with it show, apparently this has been happening to alot of customers according to the manager. When I went to another BP on the highway near ext 4 to test I filled R100 and it showed on my fuel tank that I had filled...I then tried again today at the BP in Ext 2 next to DMC and same thing the need never moved. To all who read this please be carefull and I advise not to go to the BP garage in lenasia south ext 2 next to DMC as you can see as per above something is fishy with that Garage and I would really appreciate if this can be taken further and be investigated