Dear Javed, have you shipped the unsafe product to the customer? If yes, then were you the consignor? What was the product, and why do you categorize it as unsafe?
What do you want the customer to do? Should the consignment be sent back? If yes, are you ready to bear the shipping charges of the return shipment? What is your export or import to your customer? Is the consignment on its way to the destination port? Was it sea freight or air freight? Now, what should the customer do? Should the customer refuse to do the import clearance, or should the customer complete the import procedure, take possession of the shipment, and then return the shipment to you?
If you do not want the shipment to be returned, should the customer dispose of the shipment? If yes, will you bear the disposal charges?
There are many questions associated with your post. While writing a letter to the customer, we should be clear about what the end result should be. Incomplete communication generates further queries. Therefore, let us send only one letter with complete details.
Thanks,
Dinesh Divekar