uneven rear tyre wear

I have a 2010 K12 with 24,000 miles on the clock and still under warranty until April. The nearside rear tyre is wearing on the outside and the Nissan main dealer tells me something must be out but the rear wheels cannot be tracked. They say i must have damaged it though there is no sign of damage and i have not hit any large holes in the road. I have had the tracking checked elsewhere and they say the rear wheels are definitely out...

Has anyone else had this problem and are there any suggestions as to what i can do?
 
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