Don't know what they doing

I took my 2005 Freelander TD4 to Land Rover Mokopane to have repaired as it lost all power on the hills and was jerking.<br> They did a diagnotic and quoted me R18500 to repair, which I paid.<br> Now 3 weeks later, Freelander still with them, I get told (after phoning for follow-up myself) that they now need to replace the low and high pressure sensors and an additional +R20000 cost.<br> The head office phones me to ask if I'm satisfied with the service.<br> Land Rover diagnostics is a gimmick and technicians seem to just take a chance and hope for the best.<br> I wonder, will my Freelander ever get repaired and what will the final cost be?<br> Stay away from Land Rover, over-priced and unreliable.