Trying to upgrade! Terrible experience

Terrible terrible experience in trying to upgrade my MTN cellphone contract at iStore. Apparently you guys upgraded to a new system and now phones cannot be uploaded in order to upgrade. And your MTN consultants at iStore Somerset Mall does not even know how to use your new system. It has been 2 days now and I still do not have my upgraded phone. MTN has terrible service. How do you go to a new system and then no one knows how it works?!?! Seriously how long do I now have yo wait for my phone!!