MTN! Make I go register again?

How many people have been receiving messages on sim registration by MTN?
This I think is really getting out of hand and MTN is really getting unprofessional about their services and the sim registration process.

I have registered my sim three to four times in less than 5 months! Infact my sim was barred and reactivated by MTN!
Yesterday, I got yet another message from them and I ignored with the hope that it was a general message or sent by error to my number.
This morning I received the message again and I remembered that was the trend before my line was barred last month!
I decided to call the centre and waited for another 20 minutes to speak with an agent!
I refused to hang up or choose the other several options listed while I waited. Finally, I got to speak with someone. I tried to be 'emotionally intelligent' while I explained with the hope to hear "sorry, you are safe. The message was sent by error." You know....something to calm me down and make me sigh and smile.

But NO! Infact the agent told me she has registered her sim thrice also and she started advicing me on how to get to their sim registration centres without been stressed - "I would advice you go in the evening so that the queue would have reduced."
I listened at first irritated with the response and supposedly advice and so I asked "so, I would have to register all over again?" The question was more like a rhetorical one.
I felt like crying and screaming at the same time.
The question is what is the guarantee that after this registration, there would be no need for another and yet another!
How long is this registration and re-registration cycle going to last and what exactly is the problem??