Car breakers Clinic

I have taken my car for the service as it has mixed diesel with petrol sometimes in may 2019 i had to pay lump sum payment according to their quote and the car became worsen, they told me to buy some parts in various occasions more than five times where I had to drive from Bloemfontein to Gauteng to buy those items and the car didn't came right. I had to pay lot of money again later where they promised it will be fixed and nothing has changed. It has been four years since my car was with them and I followed all necessary precautions but it seems like they don't care and this is contrary to what their name is meaning.