Broken A5 that I am paying for

I upgraded my contract in April 2015. I had the phone for 9 days, then the speaker broke. I couldn't receive a new phone because the problem didn't occur within 7 days. They fixed the speaker under warranty and gave it back to me after 2 weeks.<br> I had the phone for a month, the screen cracked. The phone did not fall or bump, but MTN told me I can't prove that, so I paid R1300 and got the phone back 2 weeks ago because of the strike. So I have had the phone for a total of 2 months since upgrading in April.<br> This week I discovered that the screen was never fixed to the phone. I can literally lift the screen from the phone. Now I'm told to send my phone in AGAIN... And I have to pay for their mistake AGAIN. <br> And every time I go to an MTN I get blank looks and no answers. Can someone please help me??? I'm at the point where I'm losing my temper with this company.