Wrong prettily damages car and Sasol terrible service!!!!!

Asked the attended to pour 95 and he repeated what I said but still poured the wrong one. I didn’t notice until the vehicle started cutting then eventually broke down. Towed it home and went Back to the garage I was then advised that they will view cameras since no slip was given. I was told that if it’s thier fault they will be responsible for everything this was Saturday 28 September 2024. Went back Sunday morning 29 September 2024 they opened footage and said they poured 93 and it can never damage a car when I’ve never used it for my vehicle.I demanded the slip so we can see which petrol he poured and they said the person with the slips is not there . Went back home Called a mechanic and he confirmed it’s the wrong petrol. Is this the service Sassa gives ? Now I must repair the vehicle when I’m not at fault? Please advise what steps to take cause this is wrong according to the law.