Asus — Company declined to change parts under warranty

Address: Surat, Gujarat

I have bought my phone in December 2014 and it is still in warranty, but yesterday suddenly there was a charging problem occurred in my phone. It shows charging in the display but won't raise the battery charging it remains at a particular level. When I showed the phone to Shree Ram Krishna Enterprise Asus Authorized Service Centre, they told me that my phone is water damaged as the strip near the charging point was red, but phone was not water damaged and, it can be due to sweat problem. Now they say I need to change the motherboard which costs me near to a Brand new phone. Now while my phone is still in warranty then I can I prove that it was not water damaged. Also the strip near memory card is not red and there is no other sign of water damage. I submitted complaint on official website of Asus company but, they are not responding properly and just keep sending me messages that my query is been forwarded to the concerned department. Following is the mail request ID is WTM[protected] for complaint. But still there is no solution it has been 1 week since the problem has occurred. I have attached the photograph of my phone opened by the service center for your reference.