Terrible Service Renault Northcliff

On our last service on our Renault Duster our cambelt was supposed to have been changed and Renault Northcliff neglected to do the cambelt change. Long story short the cambelt broke and there was damage to our cars engine. Renault took the vehicle to fix it at their expense however only gave us a 6 month guarantee on the repairs. Eight month in our car broke again with issues ranging from the crank having issues and the turbo that needed replacing. R25000 later that we forked out from our pockets our car is still not running. If a proper repair job was done on our vehicle due to negligence on their side our car would still be running. However it seems that they did a patch job with the repairs. We also requited a diagnostic report when our car was returned however Renault Northcliff refused to give us one.