If your discs and pads need replaced at that mileage ( is it really only 6,650 miles or 66,500?) and at that age then they most definately should be replaced under warranty for free as they must have been faulty.
I only replaced my pads for the first time this year on my qashqai ( just sold ) after approx 62,000 miles the discs were fine .
i would kick up a stink with my dealer if i bought a car off them and that happened at just over a year old.
best of luck get your grumpy head on and give them Jip.