The discount coupon is automatically reactivated if the order is cancelled, except for promotional coupons. It will have the same conditions as before, expiry date included.
The discount coupon is not refundable in case of return.
A quick example
You bought a hoodie that costs €100 using a discount 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".
The newsletter coupon can be used only once. Use it wisely, we cannot send you another newsletter coupon!