Good to see some formal response (even if it looks like a bot) but is doesn't change the fact there is nowhere near the level of update support offered that is expected. If I buy a premium priced device I expect to get timious security updates with it. My Mate 9 is currently on security patch date 5 April and that is with using Firmware Finder. Simply not good enough, whomever is holding up the process.
This will certainly factor in my next purchase.
I got a Mate 9 round about November. It immediately updated OTA to the Aug 2017 Security Patch (If I remember rightly) and then in Decmber did an update to the November 2017 Security Patch. Maybe the problem is your network? I got my phone from Telkom but have a Telkom and Vodacom SIM in it.