Lenovo — It shows no service

Address:	Valsad, Gujarat, 396030
Website:	India Consumer Complaints

In my lenovo a7000 i was having problem of network after upgrading it from android 5.1 (Lolipop) to android 6.0 (Marshmallow). And then i went to service center, because of the sweating the water gone inside and they told that it is water damaged and out of warranty. I told ok and gave them to repair. Another day i went and they told that the mother board is damaged. You have to buy another motherboard. So solve this please. The phone is of 10, 000 rupees and motherboard will cost 5, 000 rupees.in which i can buy a new phone. Dear lenovo, i request you to please fix this up.