My Phone MTN SIM got locked when my daughter inserted a wrong Number. I can't remember my PUK, how can i unlock it?

Hi Isaac, you need to contact MTN customer care to help you provide your PUK.
You can contact them 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