S6 Edge Screen cracks without Manhandling

I received my Samsung S6 edge on my latest Vodacom upgrade and I am very disappointed with the quality of the screen and lack of backup service. Within a month of getting the phone the screen is cracked from the top speaker part of the phone all the way down to the bottom and it appears there could be a 2nd crack developing - there is no damage to the the pixels, image or functioning of the phone but the crack is very evident when the phone is in the off position. I did not drop the phone or put it under any strain and so from what has been advertised it should almost be impossible for this to happen. I went to Vodacom to try and take it up with them because at the time the phone was less than a month old but I was told that only Samsung direct could help. When I phoned Samsung I was directed to go to the repair store in Woodmead where I was told that they could only book it in and then use my claim to fix it (no room for discussion!). I then contacted the ADH premium cover center to follow up and they also told me that the only possibility was to use my one single claim. It is not acceptable that I must use my claim to fix a product fault which had nothing to do with me!! Furious!