I can’t remember the password to my MTN router and the information on the body containing the default password has wiped

I don't know

Here's what to do.

1. Connect to your router with LAN cable to your PC
2. Find out what IP you receiving by doing the following below;
Go to command prompt (windows key + R and type cmd and hit enter)
Enter this command ipconfig and hit enter (check under LAN Adaptor, you should see 192.168.x.1 (whatever the first x is note it down)
3. On your browser enter the ip address (in my case,192.168.0.1 - default router ip)
4 Enter the password (default is admin)
5 Select your WiFi setting (WLAN in some cases) tab and you should able to see the password