ABSURD, INCONSIDERATE CONSULTANTS AT MTN

I have been calling, went to an MTN Store at Menlyn Maine no assistance to date. Iam not getting any SMS's nor OTP's on my number, i was told to input this code #35*0000*16# then switch off my phone for 10 minutes, second call i was told i don't have an SMS center number and must add *** to my message settings , i asked where as i cannot find where to add it as im using an iphone the agent could not reply, but told me to drop do those settings, told her can i do it while she on the line she told they have high call volumes so i should call again.

my concern is what happens if there's online theft so i wont get any OTP's , been trying to do online purchases and i cannot complete it as im not getting OTP's, tried cashing in my MTN MOMO not getting OTP's

I was told there is no reason for this inconvenience but it happens now and again to mtn customers. ***