Not Received the phone

My name is Nthabiseng Jessie Motaung has a contract with MTN for the past 4-6 years, I have already upgraded twice with the service provider, monthly R330, 300 megabytes, 200 sms, 100 minutes to all networks, the last upgrade was last year December 2016, the phone was delivered ( Sony Experia Z5) with monthly subscription of R440 (on special 2gig, 200 minutes MTN to MTN)

The end of May 2017, the phone started overheating then it was send to MTN since it was still under warranty, I then took it to MTN shop (Carnival Mall) , I was told that they sending it to repairs, then the feedback from the repairs was that, the phone cannot be repair, i need to get a new phone, unfortunately it was said the MTN no longer have the phone it was limited stock they nologer have the phone on stock. so the way forward was i need to select other phones which i choose p9 Huawei with the initial contract without the special (monthly R330,300 megabytes, 200 sms, 100 minutes to all networks) , from the month of May i was constantly paying the R440 every month without the phone, two weeks back I was told that the phone will be delivered within 12 working days, now they saying i must go the MTN shop to apply for new contract, am not gonna get the phone anymore, which is a bridge of contract, I have signed 24 months contract i cannot start a new contract. please I need your help please. I just want my new phone and which I was paying all this months, or I want my money back from May. Call center number ********** 667 ID ********** 701086 Nthabiseng Numbers : ********** 902 (number in question)