Asus India — battery drained and so fast reverse charging

Address: Chennai, Tamil Nadu, 600025

Website: no

Am using zenfone max pro s. No. J5aab760h121kk6, from last 2 months shows reveres charging and battery drained so fast, i went to service center chennai, 1st time rest software again same problem, so 2nd time they replaced main board on 22/9/18 with rma no. Inuij90306 but the problem was not rectified,
Then again 3rd time also they replaced main board on 3/10918 with rma no. Inuija0039 but still not rectified and same problem is persist but after service my phone battery condition is so bad.
This is 5000mah battery but in standby within 1 and half day battery is completely drained.
Am the zenfone user from 4 years, so purchased in same brand but now am really disappointed about this phone and service, please kindly replace my handset