Rojan Engines and Gearboxes

People do not buy from this people. I bought a Isuzu 4jj1 engine from them, i refitted the engine , started the bakkie, there is a knock sound, phoned then, find out what can we do, they said it is the injectors, i got the injectors fixed, did not help, i called the manager find out that can we do, he said i must send a mail, send them a mail, i send the crankshaft in to get it checked, got a report back from the engineers, send the report to the manager, i told him i will do the labour for free they must help with payment for the engineering and parts, that knock was big end barings that was knocked out. I called them, no answer i mailed them, no answer, i leave messages, i do not get any feed back from the manager at all. They say one thing and do another. People be careful before you buy from them.