Happy for you to come do this for the Vodacom (MTN and the other MNOs would love to contract your expertise as well, believe me).
You clearly have a good grasp of where these 2G devices are, how you'll migrate emergency services and other mission-critical applications running on 2G and have a plan to allow millions of people who cannot afford a phone over R300 to switch to mor expensive 3G or 4G devices. You'll also handle government, the department of communications and the regulator to convince them cutting services to a large percentage of South Africans is perfectly fine.
So, please send me your details and we'll get you cracking. Globally MNOs battle with this, so you've got a great opportunity here.