why are we experience network failurre in our area for the past 3 weeks now

Hi Adesina, you can try to power off and power on your phone for your line to be refreshed and try again, if the network issue persist, you need to contact MTN Support for assistant.
You can contact MTN support via any of these channels:
1. MyMTN App
2. Facebook: @MTNLoaded
3. Instagram: @MTNNG
4. Live Chat: http://bit.ly/2OC5bHz
5. Email: customercareng@mtn.com
6 .WhatsApp: 09033000001