GM mechanics and servicing is very poor

Took my car for major servicing(mileage 145216) with William Hunt PE.- 12/1/2016<br> <br> Paid about R12K for that service. <br> <br> A few weeks later on a drive to Alice(mileage 145660), when approaching Grahamstown the car starting losing power. I then took it to Kenrich GM-Grahamstown which is approved by Isuzu to have my vehicle checked. They worked on the car and charged me R5892.09<br> <br> On returning to PE, I took the vehicle I took back to Williams Hunt PE. as theyhad requested me to come after travelling 500Ks from the time of service. They charged me a further R786.60 for cleaning oil from the car.<br> <br> ISSUE:<br> 1. fact that my vehicle has majors mechanical issue in less than a month or even travelling less than 500kms from service(Williams Hunt PE)<br> <br> 2. Kenrich GM, worked on the car issuing no warranty on parts or work done and secondly using generic parts on my vehicle, they informed Williams Hunt about once I went the to get the car checked after 500Ks had been travelled from service day.<br> <br> Vehicle has been consistently serviced and intentionally take it to GM approved mechanics.<br> <br>