Don't know the product and bad workmen ship

I have a GWM Steed 6 that have 25000 km on the clock i lose my warranty dew to bad service from them i didn't take it for service but then i have a electrical problem that i believe is a factory fold because electrical got nothing to do with a service then i took my car to Suzuki Richards bay they told me it is the key switch then they take one from another car to test on my and the same thing happen then they say its the key coding then we do that and still the same then they say no it is the mobilizer then they take one from another car and still the same then they say it is the ECU i get new one same problem and that one also burn then they say they don't know what is the problem then i took my car to another person he manage to find out my crank censor is burnt then they replace it the car start now but after 3 kilos it cut out again at least the other person could get my car started where the agents can't even tell me what is wrong.they also Service my sons Steed 5 ask him R4500 for a 40000km service and not even clean the air filter or change the Diesel filter so i had relay a very bad experians from Suzuki Richards bay and will never take my cars there again there is to many things to mention