Nguni petroleum at Mtubatuba forced me to pay for their employee's mistake!!

On the 13/05/2023 i asked the petrol attendant whose name is Bongiwe to add R50 Petrol and she then added R500.00 of which i did not asked and i had no money for that petrol. I asked her why she didn't do what i asked, she gave me attitude and threatened me as i told her that it is her mistake and i had no money to pay for the extra petrol. I spent almost an hour there ( time wasted) i then asked the manager, i tried explaining to him that i don't have that money as a result i requested them to pump out the extra petrol.. I was then told that my car number plate has been recorded and they want money, it was not my mistake at first and on top of that i was forced to borrow the money to pay for what i never asked. Bad treatment received from that Nguni petroleum service station at mtubatuba!!