Bad client business

Bad service dealing with this company's HR Senzo Tsibande the company brought there generator to us Gauteng Generator Services Pty Ltd for a service. I had mentioned that the generators voltage was incorrect and then checked the avr and brushes that was damaged and replaced it then serviced the generator as to find at the same time they did fiddle with the idle ***** making the rpm high so i adjust it. They received the generator back in working order i did mention they overloaded the generator as well from load test we picked it up. So i was then told the machine don't work i then told them to bring it back i will look at it i did to find no fault i show Senzo Tsibande how to start it and asked him to start it and he did it is working order .Then day goes by when they phone me saying its hunting on rpm so told them to check fuel line is it open and they said yes sure, so told them to bring it to me will check whats going on. Then the owner of company NEAL SINGH had informed me that he open the carburetor to find dirt in there from the tank is dirty. I had confirmed with him saying that the trainer in the tank is the filter to catch the dirt and is clean. Then the generator came back to me saying its leaking fuel, so i saw that the fuel solinode is damaged leaking from under it, i then replaced it no leaks generator in full working order. So now this point gets me to the point Senzo Tsibande had the audacity to post this on me company's google review "Worst service ever, they messed up my generator. Took it for service and it came back with problems that did not exist before I took it for service, took it back and it got even worse. REALLY BAD SERVICE !!!!" So i find this very incorrect indeed as we went out the way for service and repair of generator avr and brushes and then i get blamed for other peoples negligence oh no that is not how we work. This is bad business dealings really lack of communications. I wonder what their clients say about their dealings with them?