No customer service in S A anymore

LeRoux motors / Isuzu Truck World have been giving me the run around and refuse to correct a botched repair on my vehicles firewall that was done by them. I have been through 3 clutch cables in less than 20000km after a clutch replacement done by LeRoux motors where the firewall got damaged and was poorly repaired. Isuzu Truck World took over any warranty claims from LeRoux motors when they closed down due to Chev pulling out of the country. No one is prepared to take responsibility and rectify the situation. THREE CLUTCH CABLES IN LESS THAN 20000KM. And they say nothing is wrong.?