Gift certificates are refundable, meaning that the holder who has not activated (or has activated) and has not used (partially or in full) the Gift certificate has the right, upon presenting the Gift certificate and submitting a corresponding application, to refund the funds paid for the Gift certificate or the remaining balance (except for gift certificates given as gifts).
The application for the refund of funds paid for the gift certificate (or the remaining balance) is processed within a 10-day period, and within the same 10-day period, the funds are returned, with the gift certificate being confiscated from the holder.
More detailed rules for the use of certificates are described here:
https://warpoint.ru/gift_rules