Extremely bad service for a lot of money

Had my D/C in for a service at Isuzu World Kempton park . After paying the R 9000 bill I drove off . At the first traffic light I stopped every ting seemed fine . As I pulled off the vehicle lost power and some lights came on . i safely pulled over , switched off and stared up again but this time the vehicle battled to start . on my way back to the dealership the vehicle had no power and I was very worried as the vehicle would keep cutting out . Back at the dealership I got hold of the workshop manager that I had delt with previously when they did not fill the brake fluid on a service . He called the technician and they put the vehicle on a lift . They the went ahead and correctly fitted the diesel filter that was not fitted correctly . I asked if the vehicles don’t get tested after the service and the workshop foreman told me the technician have to test drive the vehicle . After a bit of back and forth the technician Simon told me he did not test drive the vehicle . I would have expected the workshop foreman or workshop manager Lizwe to test the vehicle or at least check to make sure the technician has . I then sent a message to Le Roux the Dealer principal on the Monday explaining what happened . It is now the Friday of that same week and nothing from the Dealer principal . So this just shows that the captain of the ship leads by example . I will never take my vehicle back to isuzu Kempton Park . I will make a point tell everyone I encounter to rather make use of Isuzu Boksburg or Isando . This dealer probably don’t care but will once they lose business .