Pathetic service

Good Day, I'm so disappointed with MTN. I did an upgrade on both my lines on the 02nd of Dec and was advised that I will be informed of the outcome in a next few days. I've been calling no one seems to be able to assist they just ask who I spoke to and tell me the person would call me back. I have not been contacted since and do not know what the progress of my upgrade is. This is pathetic from a company as big as MTN