Mtn direct sales is terrible service!!!

On the 18 December 2018 I did an upgrade with MTN direct sales over the phone. As of today I have still not received my new handset. I’ve called the Johannesburg branch on numerous occasions, only to be told that the consultant who helped me - Nadine is the only person to help me. Last Friday I called again and was told that an email will be sent to the supervisors in JHB Branch and I will receive feedback. Nothing happened. Yesterday, 29 Jan 2019, I called in again, spoke to a rude consultant who is asking me why Nadine is not calling me back. Then another consultant told me the same thing - Nadine is the only one to help me and he will send me an email. I’ve have asked - if there’s no stock of the phone I wAnt, there is other options and I can change the phone. I just want someone to tell me, I’m on this new package with no new phone, and the new package is wrong as well as I asked for a minute booster to he added. I’ve been a customer for Mtn for more than 13 years! But this is terrible service