SOLUTION FOR MTN!!!!!
Connect iPad to PC using USB cable.
In iTunes, backup up your device, then select "Restore". iPad will reset and go through initial setup. When asked where to restore from, select appropriate option (where you backed up too). When iPad is retored and itunes is running, a message will pop up on iTunes, and ask if you would like to update your carrier settings. DO NOT SELECT TO UPDATE CARRIER SETTINGS!!! Then, go to settings->Cellular Data-> APN Settings. APN for cellular data: internet APN for Internet tethering: internet ; no need for usernames and passwords.
DONE
Confident that it should work for all networks, but have only tried on MTN.