Thank you for reaching out to the Samsung community! We do apologize for the inconvenience caused to you due to delay in the release of Oreo OS for your device. Samsung constantly works towards bringing-out the best updates and incorporating the latest technology along with great features. We at Samsung, ensure that Android OS update which is launched, is bug free and is compatible with current running apps in the marketplace before they are available to our end users. The availability of the update would be notified to you via FOTA notification (settings> software update>Enable automatic download updates).
Be sure to hit ♡ when you find an answer that works for you. For Further assistance, you can get in touch with us via Live Chat option by following- http://livechat.support.samsung.com/Customer_new/IN. You can also connect us via Samsung Members web community by following mentioned url-https://community.samsungmembers.com/en_IN#/