Regarding the cashback of the voucher on cancellation of order by the client itself.

Description

I booked a flight ticket on easemytrip and got a cashback of Rs. 750. I used the cashback on 1mg and ordered some masks and gloves. The order got split into two parts and the mask got delivered but the gloves were cancelled by the client(i.e. 1mg) itself. Now they refunded the money to my paypal account but its showing Rs. 0 refunded to my paypal account.
This is not done as the order is not cancelled by me it got cancelled by 1mg due to delivery failure so why i should pay for it.
So kindly refund my cashback voucher of the same amount i.e. Rs 334 to my paypal account as it was not my mistake.