Poor Customer Service From MTN

I'm disappointed with the service that myself and my dad have received from MTN . My dad is the account holder and I'm the third party using the contract phone. Sales consultants have been calling me on my phone with regards to an upgrade and I have been hesitant about it . Then finally this year when one of the sales consultants called me for an upgrade I informed my dad about it and he agreed that I could upgrade and then I also gave the sales consultant my dad's number so that they could confirm with him with regards to being the account holder.

Fine , the upgrade was approved then problems started when DSV couriers had to deliver the package , I then requested DSV to contact the account holder of the package directly so that he can receive the package, they then said no I should call MTN to update the contact numbers on their systems, I then contacted MTN but everytime I was transferred to the contract department my line would be cut off , I then opted to DM MTN on Facebook and I got the very same treatment that the account holder should contact MTN . Why is it that after the upgrade has been approved now we are being told that we should contact MTN but before that the sales consultants could contact both me and my dad. I understand that MTN doesn't work with third party but what is so difficult for them to contact the account holder . I'm so frustrated to a point were we regret making an upgrade with MTN. This is not how your customers should be treated . Next thing you will be billing us on a package we have not received!!!!