Sim say "not registered on network" over a month, but account is paid up

Mtn is very quick to refer an unpaid debit order to ITC and deactivate the sim card but it takes them more than 1 month to reactivate the sim card. i have been waiting for Mtn to reactivate my sim card since the 23rd Feb 2018 and all i get is response emails from Nomvula Zwane to advice that the sim card have been activated but it is still not working. I have been sending them emails every week to find out when the sim will work again, guess what, to date she still says in 24 hours, and they give you a contact number which doesnt work. Their customer services agents are clueless when you ask them questions, nobody knows who is supposed to activate the sim card. i requested for the bill and the same Nomvula Zwane said they cannot send ne a bill as the contract us still active.... well its active on their side but the sim card on my side stays on "not registered on network". This is bad service at "A" grade.