Hyundai Motor India — battery drainage of key

Address: Kollam, Kerala

Hallo, i have 2015 model grand i10 asta optional, and barely completed 25000 km, now car key is draining very fast. Means last 2 months we have visited 3 times in service station. But unfortunately they have very poor service as just change the battery and send back. And the same thing happening evan after 5 days. So this is fourth time we are going to visit service center in kollam (Kerala). As its stands so far they are not even recognized or not showing any interest to fix this,
Looking forward to hearing from hyundai