Nissan Navara D40 Transfer Case problems

Just wondering if anyone has had any issues with their transfer chain?

I have a 2008 D40 with 50,000km. I took it into Nissan after it made cluncking noises when I took it out for the day. The 4WD light came on the dash whilst I was driving on the higway on the way home.

Nissan have pretty much said to me that they are voiding my warranty for this part as I have "forced and mis-used the vehicle". I have questioned them for the last 5 weeks (as that is how long my car has been sitting up on the hoists at the workshop) to explain how I have forced and mis-used the vehicle and to also get a detailed report on their findings. Not once have they been able to give me any of the requested information, I did get to see (but not get a copy of) the initial report from the mechanic which was "chain has stretched, oil is clean, no loose metals" - and this is what Nissan Australia are basing their judgement on.

I have lodged a report with the Dept of Fair Trading who have contacted the MVSU to investigate this matter.