Unsatisfactory service recieved

On the 17th September i went to buy petrol for my vehicle at your Garage in Ugie in the Eastern Cape (Hilton's service Station). A lady attended to me, as she put the pump into my vehicle, there was some strange noise in the vehicle as if the pump was vibrating, I asked the lady and she did not respond, then she finished and as i was driving away my petrol gauge did not move it remained on empty, which was very unusual to me, the lady's response was that i must go it's going to come up, so i went away but nothing happened, fortunately i am not staying away from town so in the morning i went to another garage and bought petrol for the same amount and my gauge quickly moved to where i was expecting it to be, i took the slip to the caltex garage to show the lady that i bought the petrol somewhere else and it moved, the lady didn't want to here it and started shouting at me telling me that it's not her fault, it's her bosses pumps so there is nothing she can do, she won't even refund me, i must call her boss, when i called her boss, the boss told me that she is not around until the 28th so she also cannot help me hence m seeking your intervention on the matter. About the petrol i didnt get and yet paid for it and the treatment i got when i enquired from the attendent.