Thanks for being with Samsung and for sharing your concern. We would like to inform you that kindly follow the below steps to overcome the contacts issue: -Navigate to contacts>>3 dot>>manage contacts>>Import/export>>Export contacts to SD card. - Kindly delete the device contacts and Import contacts from the SD card to the device.
I do apologize for the inconvenience to you due to delay in 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. However, the update depends upon the device compatibility also. Once the update is released we will notify you via various means of communication. 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#/