You should receive a voucher code via email, You can use the voucher code to purchase any item on Coshk.com website. A refund voucher is 30 days, and You need to use your voucher during this period, it can be used on several purchases until its balance reaches 0.
Using My Voucher:
Enter your voucher code in the voucher code box and click “add voucher” during checkout at payment step. A corresponding deduction will be applied to your total amount.