BAD SERVICE FROM HYUNDAI VEREENIGING

On or about the 29/07/2021 I took my car for service at Hyundai vereeniging in good condition for 165 000km. within two days the engine started vibrating i then called them to find out what was the problem and they said i must bring the car back to them, it was on the 1st of August 2021. They checked the car and said it was only small water in the engine and they flushed the water out, after the car was perfect but before i arrived at home about 35 km the car started again and called them immediately and told that i must book for an appointment to look at it. i took the car back on the 13 August 2021 and i was told that the car was checked and the coil pack on engine needs to be replaced and it will further cost me R6715 then i declined their service because the car was on good condition when i sent it on the 29th July 2021. I checked the car by myself, i opened the coil pack on the engine only to find out that my coil pack were replaced, one coil pack it was wrapped with black masking tape and another one was KIA MODEL coil. what is surprising my car was in good condition with everything which was in the car, there was no vibration, no engine cutting, no funny sounds and no overheating. That is why i believe that the coil pack were replaced with non-working ones and this is a practise that needs to be exposed.