Shocking customer service

My cell phone contract was due for renewal in July 2017. I was literally called by MTN at least three times a day for two months to renew my contract. I eventually made up my mind which contract to proceed with and called MTN to renew my contract. The contract that I selected entitled me to receive a new hand set. I have been waiting patiently for over one month for my new hand set to arrive, and I followed up with DSV on Monday this week. DSV advised me that MTN had given them the incorrect cell phone number, thus they could not contact me to deliver the hand set. How a service provider who issues a cell phone number makes this type of mistake is frankly beyond my comprehension! DSV advised me that they would contact me immediately to make delivery of the phone. I have still not received my hand set, so I called DSV yesterday who advised me that my hand set had been recalled by MTN and sent back to the head office. After hearing this news, I called MTN and expressed my utter dissatisfaction at the manner in which my account was being handled. I was advised that the Supervisor would contact me in two hours to address my concerns. Believe or not, I still have not heard from said Supervisor (no surprise)! Was is astonishing is that MTN went to the ends of the earth to secure a renew of my contract, but once renewed have had absolutely no interest whatsoever in honouring their side of the contract by ensuring I had delivery of my hand set. I have previously had major issues with MTN but decided that I would give them the benefit of the doubt. I am now very angry with myself for doing this, as I have had nothing but problems with MTN from the beginning. I cannot fathom why I need to beg for service delivery and why I need to go to such measures. I am exacerbated by the absolute lack of care for customers in what is a highly competitive market. I am now locked into a two year contract with a service provider who frankly could not care less about assisting their customers. It seems like the only thing that matters is my money!