If you have ordered a certificate but have not activated it (never submitted your CSR or completed domain control validation), the certificate will be refunded automatically after 2 weeks.
If the certificate was issued and is active, you can generally refund it within 1 month, depending on the SSL provider. For more details on refunding an issued certificate, please contact our Customer Care and they should be able to assist you.
Alternatively, if you no longer need your SSL certificate, or it became compromised, it can be reissued and assigned to another domain instead of being refunded.