My mtn line is not sending international messages

i know its niot my NIN cause i've done that a couple months ago, and network comes onn sometimes whenever there is network issues in my area, and then stops working later...

I can't send SMS despite having a correct MTN message center number. Help me resolve it please. this is my number 08039374438

I can’t make calls nor send messages with my MTN line. I only receive calls.

Received zigi OTPs. I have been able to check my balance and received text messages from MTN. But I could not use the linecgr