The current promotion running for the fixed wireless devices, you get free double data and Afrihost are subsidising up to R1999 for the LTE Modem.
The data is billed for. If you signed up for the 25GB for R299 p/m, halfway through the month you will pay half the price of the data and receive half the data for the rest of the month.
For further assistance please visit client zone: https://clientzone.afrihost.com
and see our FAQ page: https://www.afrihost.com/site/faq/fixed_wireless