Lava Mobiles — booting issue

Address:

380054

Hi i am having lava x81, phone was under warranty and it had a problem of automatic shutdown problem and then i was trying to boot it but the phone was not starting, putting it on charge for hours only the censor was getting lighted and the battery indicator is not shown on screen, i visited the devansh lava care ahmedabad they told that it is the battery issue and the phone is having inbuilt battery so we have to replace it which will take 700/= i paid the amount and left from the store, after reaching home device had same problem i again visited the store they told me that will will check it further, later they told me that will have replaced any other part now it will work great, i again left from the store, again it had the same problem later i got the replacement of the device and after the 15 days of the replacement i am having same problem in this device as well, phone is out oh warranty now and the service center is saying that there is issue with the mother board and it will cost 8000/=