Engen Silver Lakes Convenience not trustworthy

I Visited Engen filling station on the corner of Lynnwood and Solomon Mahlangu Drives in Pretoria Yesterday 14-05-2023, where I requested that my Vehicle's fuel be filed up and the attendant check the oil; water and Tire pressure for me, as he proceeded to fill my car I visited the convenience store. Once I left the store the petrol attendant told me that there was a leak on one of my vehicles tires, he checked for the leak and attempted to fixed the leak. I informed him that I did not have cash and that I would pay for the fuel along with the attempted repair by card (The Fuel amounted to R742.30, and I was told the attempted repair was R70), he took me inside to one of your cashiers who told me I could insert my card and pay for my transactions, as I was about to enter my card into the card machine I saw that the total amounted to R1380.30 I was shocked and asked her what was going on and she told me she made a mistake and added a customer who paid cash to my total, she than asked the petrol attendant for the money and he took it out of his pocket and gave it to her. Secondly after the attempted repair to my vehicles tire I had to take it to a tire specialist to have the botched repair fixed as the tire kept on deflating every few hours where it did not deflate so fast previously.