Pajero Sport smoking like steam train

I purchased a Pajero Sport in late 2014. On the 1st service I notified Mitsubishi of the excessivel black smoke from the vehicle. I was then told that this was normal. This statement was said without testing the vehicle. I then pushed them further and they eventually had the vehicle sent for some further tests and resetting. The vehicle came back better but not correct. <br> I then sent in the vehicle in again for the 20000kms service and again asked to please relook ay the problem of bad black smoke emmisions. I then had to take the car back for them to do tests. They informed me that there was nothing wrong. <br> On the way back home I drove behind the vehicle and it was worse. It smoked on normal acceleration and huge plumes of black smoke when the car kicked back to accelerate. <br> I have never driven behind any other Pajero Sport that smokes like this. When driving i have put my foot down for acceleration and the smoke is so bad that cars behind me slow down or change lanes to try and get away from the black smoke.Surely Mitsubishi cannot accept this type of smoking. Over fueling wil justl lead to premature engine failure.