2-Month old Device deemed out of warranty

I purchased a Sony Xperia M5 Dual on contract in December 2016 and received the device on the 8th January 2016. I had the phone for almost 2 months before the screen started acting up and then went blank. After numerous trips to the City View store (Durban), my phone was finally booked in for repairs. <br> <br> On the 23rd March, I received an SMS that stated that the repair was deemed out of warranty and that I was liable for the cost of R3512.76 in order to repair the device. The SMS also stated that a consultant will contact me shortly. Today is the 29th March, and I'm still waiting for that call. I haven't been given an opportunity to learn what was wrong with my device and how it was deemed out of warranty.<br> <br> The device was never dropped or handled negligently at any time. The device is also dust-proof and waterproof, so water damage cannot be an issue (The device has never been immersed in any liquid either). The issue was with the software. I'm now paying for a contract with a device that does not work and I had to borrow a phone because I have no idea when this issue will be resolved.<br> <br> It's a very frustrating position to be in. Please contact me to resolve this issue.