Bosch Car Service Menlyn Auto Centre

I am extremely disappointed with Bosch Car Service Menlyn In December I took my vehicle in for repairs, due to overheating and fuel leakage. They repaired the vehicle and I got it back on 23 December 2022 I started driving with the vehicle on 3 January 2023 Two weeks later 18 January 2023 the vehicle started overheating again I paid around R7000 for them to fix the cooling system and now after driving the vehicle for two weeks it has overheated again. It feels like the repairs done during December were not necessary and not what was causing the problem. They called me yesterday to tell me that the problem may be situated on an area that they did not work on, trying to imply that I would have to pay again for repairs to be finalised. What did the R7000 repairs fix then ?