Hi Joshua, It may be that a wrong name was used to register your line, you may need to do SIM registration update. You can also contact MTN Support to help you confirm the name on your line.
You can contact MTN support via any of these channels
1. MyMTN App
2. Twitter: @MTN180 / @MTNNG
3. Facebook: @MTNLoaded
4. Instagram: @MTNNG
5. Live Chat: http://bit.ly/2OC5bHz
6. Email: customercareng@mtn.com
7. Call Center: 180 or +2348031000180 (if you are calling from abroad or another network)
8.WhatsApp: • 09033000001