Extreme Incomptence

I took my Honda in for service to Bosch randpark Ridge. They gave me a bill for R7k which we paid. After the service the car within a week the car started overheating and the gasket was blown. They now gave me another invoice for 40k. I spoke to the manger for which his response was it was neg lance on my side. I spoke to the people at honda for which their response was the techinican that serviced the car didn't do a good job which resulted in the overheating and the breakage. Bosch management is not willing to take up the responsibility for the negligence and is not willing to pay for the repairs. Please dont take your cars there as I have also had another colleague of mine with a similar experience. I am going to take the matter up legally, but I am writing this so that it helps at least one person from harm.