Terrible...Actually No Service from MTN!!!! Continuously!!

I upgraded my phone on the 13th of December. I then tried to contact them for update on my upgrade and I continuously received poor service. The 12th of January I called to cancel my upgrade, but then they could help me all of a sudden. We sat nearly the whole day to find the best option that was in stock for me and I was promised delivery within the next 10 working days. Till now, regardless of all my calls and emails, I am yet again without my phone or an update on when I will actually receive my new upgrade. I have run out of options and will power to even call MTN. No matter who answers the phone, I don't get the service a long term customer deserves.