GO to your provider an request a NEW device
Do this : Contact 1st Samsung Service in your country and tell to them the problem becouse this a factory fault phone .
After you make some papers and a proove that you contacted already the samsung Service from your country , contact your seller and show him the problem
YOU MUST proove that : you did NOT DROPED your PHONE , DID NOT SHOCKED YOUR PHONE with some other things , like drop with speed in bed trow in the pillow etc etc , proove that you did not used any screwdriver , to have ORANGE WATER SENSOR in the back under the battery STILL ORANGE and NO ROOTED PHONE .
THEY WILL CHANGE YOUR DEVICE , BECOUSE IS IMPOSSIBLE TO FIX THAT IS A PART OF A PLASTIC THAT WAS SLIPPERED FROM HIS PLACE .