Poor service from MTN DIRECT

I upgraded my handset on the 18 December via MTN DIRECT SALES. I was advised that I would receive the handset the following Tuesday 22 December. 2 days later, still no handset or a call from MTN DIRECT SALES to let me know what was happening. I called on 2 occasions to establish what was the delay and was advised that I had to speak to the consultant who sold me the phone however they would note my call. What I find most disturbing out of this whole process is that to date, I still have not received a call from MTN DIRECT SALES and NO HANDSET, yet I have been emailed an invoice for goods I haven't received and signed for!