Damaged car and financial loss

Horrible service, damage to my car, and financial loss due to this incident I went to the engine garage in east fabric via tsamaya road in Mamelodi to fill up patrol around 15:45 on the 25/03/2023 and the attendant never closed my cap properly due to that it fell off my car this coursed my patrol to fume out I went back to the garage the manager showed me the footage and said the employee did nothing wrong this was the last place my patrol cap was tempered with and they refused to help me I want my patrol cap replaced and the patrol back that I lost driving up and down without a cap. Horrible service