Devious guarantee policy

The screen of my S4 cell phone was cracked I took it for replacement on the 26 Aug 2015. They said that the guarantee finished at midnight of the 25th Aug 2015. I bought the phone on the 26th Aug 2013. This is the most ridiculous devious clause I have ever encountered. To add insult to injury I had taken it on the 25th Aug 2015 and was told to return with the proof of purchase which I did the following morning. I thought that Samsung was a reputable upstanding company. My dealings with them was so disappointing. They had the phone for 2 weeks with no communication. I phoned several times, managers were not in or simply couldn't be bothered to return my call. Although I was liaising with them they phoned my daughter and told her that they could do nothing and that we had to pick up the phone. I am thoroughly disillusioned with Samsung!!!