Have you been served with a notice for not having present in your seat during working hours when inspection was carried out by your senior? if yes, then you could have replied with, the matter of fact that you had left your seat to drink a glass of water. If no such notice is served to you to explain your absence at the time of inspection and based on this if your salary was stopped, then its a clear case of harassment by your senior, inspite of your impeccable work record and the action of your senior goes against the labour policy.