For each unused service voucher, you can request a refund or exchange before the expiry date of the voucher. This is completely free, both for paper and electronic service vouchers.
Electronic service vouchers
The exchange or refund of electronic service vouchers can be done via the secure zone at: soeasy.sodexo.be
Paper service vouchers
For these, you need to fill in a form on the Pluxee (Sodexo) website