MTN Upgrade service is horrible

I tried to initiate an upgrade on behalf of me father in law and then allow MTN to phone him to confirm. We had an upgrade lined up of 480 a month. The contacted my father in law confirming this amount and the upgrade was processed. Only to receive a call a few days later stating that they made a mistake and that it will cost an extra 200 a month. That is when I declined the offer as it is not what we signed up for instead MTN said they will make arrangements to get me the same deal for 500 just with a bit less minutes and Data. We agreed. Now it has been more than a week and a half and they have still not reversed the previous deal and processed the new upgrade. Their excuse being that they are waiting for a reference number from the warehouse to say the courier company has delivered the phone(which we never took delivery of). I was assisted by Sizakele and I have not received feedback from anyone.

This is the worst service I have ever received.