Bad services

I had a over heating issue on my vw amarok, and tool it in to vw constantia, and the apparently done a diagnostic test and found out the issue claimed from my warranty and knowing I'm a person with a disability they gave me my car back saying it's all sorted, drove it for 40km and it done the same thing, took it back and they decided to blame the water pump and the service advisor removed it from the first claim so insurance did not approve it, called me to say your vechile is 100% and they have test driven it says the workshop manager. It was mid Friday afternoon and I drove my van for less than 40km and had the same issue called vw again and I got told that I will be reliable the job that they have not completed. And I must pay for whatever seems to be the issue, with my disability they left me stranded they are ****s and rude people.