2 Week Old Phone Needs repairs

I recently upgraded my contract and have my new phone for just over two weeks. I have picked up an issue with the phone where by I cannot unlock the screen without having to plug it into a charger and then when doing so the date and time is incorrect. I have contacted Sony who advised me to do a Factory Reset, and thereafter a Software Repair if the Reset did not work. None of this has resolved the issue. Contacted your Call Centre who advised me to book my phone in for repairs, which has a 15 day turnaround time. This is unacceptable as the phone is practically new, thus in actual fact needs to be replaced!!! I cannot be without a phone for 15 Days!!!! This is really pathetic and at this point I actually just want to Cancel my upgrade and you can keep your phone! Please resolve this ASAP. I don't see why I should be running around to go to a store and book it in for repairs and then wait for 15 days to receive it back. I have previously booked my old phone in for repairs and the waiting period to get my phone back is pathetic.