Cancellation and refund Japan Rail Pass

How is working process of cancellation JR Pass (received but not exchanged) in case cancellation of the trip to Japan and refund

Ask the agent you bought it from.

Normally you send it back, they deduct a fee and issue a refund.

I have done it before, it was pretty simple.

If you happen to be in Japan already and have not exchanged it already, you can get a refund at any major train station that handles JR Passes. I have done it before. Pretty simple and quick.

From the official JR Pass website:
�gIf you have purchased an Exchange Order in a country other than Japan, a refund for your Exchange Order is available only at the sales office of the travel agency from which you purchased it. If you have purchased a JAPAN RAIL PASS in Japan, a refund is available at domestic sales offices. In both cases, the application for a refund must be made before the starting date of the validity period, in principle. Please be aware that if you have purchased an Exchange Order/JAPAN RAIL PASS with a credit card, a refund is available only at the sales office of the travel agency from which you purchased it. You will be refunded the value of the PASS in yen, less a 10% handling fee.�h
http://www.japanrailpass.net/en/about_jrp.html