The laptop is the company's assets, which was your responsibility to return it back to the company after submitting resignation, and had it's receipt, which you did not. So now you are liable to pay its cost to your employer company. Your another fault is that you did not serve the entire period of notice also, which you failed to state in your post herein, whether it is 30, 60 or 90 days, then liable to pay them the shortage too. If you are interested in relieving and experience certificate, then please do their bidding, otherwise move on silently. Novice lawyers will lend you in trouble, is my another opinion. Accept or reject these is your right too.