If you got a new sim recently it should be LTE capable. If it shows LTE on the sim it is.
PM or go via email support and ask them to activate LTE on your simcard. It takes a day or two during working hours and you should usually get a sms and email when its done.
To have your sim card provisioned for LTE access, I'll just need you to send me a PM with the username for your Afrihost account or the username of the sim card, and I can request it.
It should not take more than a few hours to complete.