If the Recipient refuses to take delivery of goods, then the transporter can get one more E-way Bill generated with the help of either Supplier or Recipient showing it as a "SALES RETURN" and Return the goods to the supplier.
The Supplier needs to issue a Credit Note along with the GST amount.
Note that the "DELIVERY CHALLAN" needs to be prepared by the Recipient ( Customer ) and shall be prepared in Triplicate.