Warranty doesn't exist

Last year my sister & I got the Samsung S4s not knowing that was the biggest mistake! Early this year my sister's phone just refused to switch on and when she took out the battery she realised that it was swollen. Last week Thursday while charging my phone i felt that the charger was extremely hot so I switched it off and removed it from the phone. I could smell something burning coming from both the phone and the charger. On closer inspection I realised the charging port had burnt. Later that night I tried charging my battery using my friend's phone but it still refused to charge. Sunday I took both phones to the Samsung on 14th Avenue in the West Rand, & was told my warranty doesn't cover physical damage. Both phones are still under warranty but we have to buy new batteries. I used a Samsung charger to charge my phone but Samsung doesn't want to take the blame. My sister's battery is swollen but again Samsung doesn't want to take the blame. Basically what Samsung is saying to its customers is that we can sell you faulty equipment and its ur own responsibility to fix it. I have always been a loyal Samsung customer but as of Sunday no more will I spend money on any Samsung product.