I own a Karizma as well.
There has always been a faint contact between the discs and the pads, right from the time it was bought new. With more than 10,000 km done, the sound is yet to go away.
I suggest you ensure that the wheel is moving freely with the bike on the main stand. If it moves freely, ignore the noise. It is nothing more than a minor irritation.
If it does not move freely and comes to an abrupt sort of halt while rotating, then get the HH showroom guys to fix it; ask for the head-mechanic and explain the various methods that have already been tried to fix it - and insist that the fault is diagnosed and rectified.
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