Your email will only be used for contacting you about any issues with your order and along with your mailing address will be discarded within 90 days of processing your order. SketchClub has no interest in acquiring or storing data about you (not saying you aren't interesting or anything ).
If there is a problem with your order of physical goods they can be replaced or refunded. Just see the instructions you receive from Amazon with your order.
Heart packs cannot be refunded once properly processed and credited to your SketchClub account. If there's an issue with your order please contact firstname.lastname@example.org and it can be fixed.