Cheating in BP garage

On the 5.11.I “put” petrol in bp garage in Delmas, Mpumalanga. I had only 80km petrol left. I wanted petrol for R200. The petrol attendant charged me R200 and I paid with card. I started the car and it was still 80km on my dash board. I confronted the attendant telling he didn’t put the petrol. He said I must give time for my indicator to grow!!!??? So I made a little circle and it was 79km. I went to the manager and he wasn’t bothered at all and just said “my people don’t *****”. I asked them to pump it out and give me money back. They refused. I put petrol every week and the petrol indicator grows immediately not in few days or hours like bp attendant suggested. My car is less than 2 years old and it’s not broken- another attendant”s suggestion. The same day after my work I went to another garage, put petrol for the same amount and obviously petrol in my car increased. I complained to BP customer service the same day and I sent them all the pictures of the slip and my petrol indicator. They haven’t responded yet...I know it’s only R200 but I work for that money... and the most annoying part is when the attendant got caught instead of fixing it he was talking stupid stories.