Mtn lackadaisical response to **** alerts

I received an otp sms notification I never requested. So as advised by the sms I called the helpcentre to report ****/*****. And I can't believe mtn laissez faire response to possible *****. I've called 3 times, each call lasting just over 10 minutes only to be cut off just before the 11th minute. Surely issue of ***** reporting should take precedence over other account issues. Or has such become a norm for mtn users that it can just go on the list of normal enquiries? How can the onus be only on me to report such when the channel I'm supposed to report to is dysfunctional? Then surely mtn has to better it's authentication systems before issuing out otps in the hope that it's the user who requested them.