So Frustrated with damn MTN

Im really at my wits end with MTN. On continued upgrades of my any device i contiously have a glitch on the stores systems which dont talk to the call centre systems. I am due for an upgrade. I go to the store and they cant process the request and request a call to 135. 135 doesnt take responsibility as their system shows all ok. Between the store and the callcentre im actually not sure who is responsbile for this glitch to be removed in order for the upgrade to be processed but no one takes responsibility....Im so frustrated calling and emailing to get this sorted and no one gets back to you to inform you it has been removed.