I called customer service last week. Happy assisted me and assured me that as soon as Vox let go of the line, Afrihost will take it over. I confirmed with him that I will be active on the 1st and he confirmed back.
Shocker... I am currently without Internet and the WhatsApp line is not available
Which provider are you on? If it's Openserve, you can just switch credentials.
Otherwise, please also try to activate with activate.afrihost.com - should work if the line has moved over to us.