Cashmere is a fine fibre and pilling will happen depending on the amount of wear and your cashmere experiences. This is not symptomatic of inferior quality, but rather an inevitable consequence of the careful processing of this fine fibre. To prevent pilling avoid any rubbing motions with your handbag & purses. Also try to keep your knits away from jewellery as it can cause snags.
Pilling can easily be removed using a de-bobbling comb or even a standard razor, though you need to be very careful not to cut the fabric if doing so.