Not complying with warranty

My sony xperia Z ultra developed a hairline crack across the screen. No physical damage on the phone and its always kept in its case. Was not dropped simply when i took my phone out my pocket the screen was unresponsive. Then i noticed a hairline crack across the screen. When searching for the issue i came across the website below stating its a manufacturers defect and is covered by the warranty by Sony them selves.<br> Or simply search \sony xperia z ultra screen crack problem"in google and u will see under the first result where it is mentioned.<br> [URL Removed]<br> MTN refuses to recognize this as a problem and does not want to replace the screen under warranty. <br> In the link above it also clearly displays which damage is covered and which is not. I am happy to supply images of the damage as proof that there is no damage on the phone. <br> Once again MTN disappoints with service. <br> Should mtn want to rectify this problem please contact me on my work number during office hours 9am-5pm as my phone is useless. <br> ***"""