LDR engines is a nightmare

I bought an engine for my Mercedes 220d for R95000. The engine had problems from the start. LDR engines said they will assist but I must bring the car at my own cost which was not cheap since I am 500 kilometers away from LDR engines. LDR mechanic said it was sensor problems and I have replaced them at my own cost. The engines is still having the same problems as it was from start up. The engine is still under warranty. My advice is don't do businesses with LDR engines.