Samsung — Samsung galaxy active 2 watch battery issue

This complaint is regarding the Samsung galaxy active 2 watch .I purchased the watch in a flash sale from Samsung India shop online.I ordered 2 watches .I have used my sister's account to buy .Out of the 2 watches 1 is working perfectly fine but in the other one i faced battery issues and some connectivity issue to mobile plan which is a feature available through app. I have registered the complain on the customer service portals and chats the initial steps which they asked me to follow was to provide photos and screenshots of the bills which i provided . Next thing they asked was to take the watch to a local service centre where they will inspect the watch regarding the issue. Even that one i followed. I went to the service centre 4 times that day. On my 4th visit they said they don't have authorisation to take smart watch issues. Later i have contacted to customer support regarding this but every time they are responding me that they are escalating my complaint to higher chain order and absolutely no resolution has been provided to me. The order was placed on 16th of July(online) and i have been registering complaints from 25th July . My contact number - [protected]