MTN NEED TO WAKE UP

I have been a loyal MTN Customer for over 10 Years I just recently upgraded my phone with MTN Direct- the phone was faulty and I took in to an Mtn Store on the 16th of October 2018 the lady I booked it in with said it would need to be sent to Jhb and should arrive at the warehouse by the 19th October 2018, after daily follow ups and NO response, then I finally get told it takes 21 days to do an assessment, on the 21 day mark I followed up which was the 9th of November 2018...THEN I get told that my phone hasn't even reached the warehouse for assessment and it is still with DSV at the depot- BUT IF ANYONE BOTHERED TO FOLLOW UP ON IT THIS WOULD NOT BE THE CASE! As this is my business phone and I am the one LOSING MONEY NOT MTN OR DSV, And Im am paying for a phone I dont even have anymore, so they agreed to send me a new device, they CHECKED STOCK WHICH THEY HAD and said they would send me a new one to be dropped off the very NEXT DAY this was on the 13th or 14th of November 2018. I followed up on the 16th Of November 2018 as to when I would be getting my new device- again no response. Then I get a phone call on the 19th Of November saying that there is no more stock - now this has become my problem and they are trying to sell me a phone that is nearly double the price of my new upgraded price- WHICH IS TOTALLY UNACCEPTABLE! Ill Gladly take the new model of phone if they can give it to me at the same price as my upgrade price or they need to hold DSV Liable and charge them for the remaining amount left on the new fee. I cant believe the total DISREGARD and unacceptable SERVICE i have received over these past few months and I am totally disappointed with MTN. As no one is making an effort to solve the problem which is not mine. I will GLADLY go stand in the queue at the bank and put your debit order on hold as I will not pay for something I don't even have in my possession. This MATTER NEEDS to be RESOLVED URGENTLY or I WILL go elsewhere...!