International sim - all calls now barred

[Lescrichton]

Hi. My phone is definitely unlocked.  I have put in an mtn sim and it picks up the network but now call barring has been activated.   I can disable it with a pin - but I don't have one.  0000 doesn't work.   Any ideas?  Thanks! 

[Rhydz]

Does this help?

https://www.mtnwhereru.co.za/forgotpin.php