Samsung S6 warrantee

I bought a samsung s6 in April when it was launched in SA. I have never had any issues with the phone or with Samsung. I have had a Samsung S4, tablet, TV, DVD player, fridge and a NX 30 camera. My phone has never been dropped and has always had a tempered glass screen guard and a casing on. Today my phone was working 100% and when I packed up at work I noticed it was off. Plugged it into a charger and nothing. I immediately drove to the samsung repair centre in Century City (cnr of Park lane and Century Way). I gave them my proof of purchase and filled out a form. The service assistant walked to the back with the phone only to return and say that the warrantee is void as there is damage on the frame of the phone. Once again, this phone has NEVER been dropped. Like all phones it has one or two minute scratches but how can the fact the phone just died possibly be attributed to a scratch on the edge of the phone? This without it being tested or proven that there is not actually something wrong inside the phone? 3 months after I purchased it! Now I have to pay to fix a phone as it apparently can not be handled like any other phone. This is shocking. Truly.