Defective PHONE NOT REPLACED

I had an issue with my Samsung Galaxy S6 and took it into the MTN Store that I received it from, told it will be going into repairs and I will get it back, got it a week later and not even 5 days later the same issue happened twice where I am left without a device, I then took it back to the store and I WAS TOLD I WILL BE GETTING A NEW DEVICE. To this day, nothing has been done but my phone has been repaired a second time and I will not accept that. I was told I will be getting a new phone and that is what I want. I pay over R2000 a month for my phone and I have been a customer for years without a faulty phone. MTN is just giving me the run around. <br> <br> I want my NEW cellphone in my hands ASAP, the old phone is as good as garbage to me as the phone was not even 3 months old and the issue happened 3 times, I did not want the phone repaired again