The coupon is not refundable in case of returns, but reactivates automatically. This applies to credit coupons only.
A quick example
You bought a hoodie worth of €100 using a credit coupon of €20, so the final price of your purchase was €80. Then you decide to return the hoodie: at that point, you'll be refunded with the same €80 you have paid before - here's the sense of the phrase "not refundable in case of return".
Finally, the credit coupon used during your purchase will be automatically reactivated at the same conditions as before, expiry date included.
The newsletter coupon can be used one time only. Use it wisely, we cannot send you another newsletter coupon!