Petrol not on my gauge and I paid. Caltex Salt River Cape Town

Today I was ****** broad day light at the filling station. The manager of the station is not on duty and I need Austin to be investigated. I drove into the filling station to top up my reserve of +- 75KM as per usual with a R100 which is 6.94 litres which is equivalent to 120Km and i was expecting to leave station at +- 200km and my gauge didn't pick up as per the usual. Fought with the guy and he was insinuating that it's going to pick up. There is no problem with my car. I told him I would show him and poured another 6.94Km fuel and my gauge picked up to what I new factually. My registration is CA 606-750 and I drive a black Renault Sandero. I was supposed to leave with 240Km worth of fuel plus my 72Km which would ad up to +-310 Km. I want my R100 back and the station has to fire that Austin guy, please investigate we cannot be robbes like this. I know my math and my car and please get to the bottom of this or I will hashtag till a million times on Twitter and the whole of SA will no not to pour at Caltex. Kind Regards. Miss T Joyi.