Samsung S4 Battery Over Charges

I have always said that Samsung is the best, but after the service and the way I was treated on the 08/06/2015 I will never support Samsung again! <br> <br> <br> I was told that I have over charged my S4,and the battery only has a 6 month warranty, and that I need to buy a new battery. <br> So I bought a new battery and in the shop I tested the battery and my phone would not switch on so just to be told that this is a brand new battery...... So the lady took my phone to one of the technicians and then was told all of a sudden my phone now has liquid damage? So I asked so how do you know it has liquid damage no they will have to open the phone to see......? I cannot be refunded for the battery so I now sit with a phone that does not work but I still have to pay it??? The best of all is that apparently my phone is out of warranty but I only took out my contract in August 2013 but on Samsung's system it says it is out of warranty since May 2015. I would like to be refunded for the battery I bought and is now not working..... <br>