[Resolved]  Byju's — tab not working

I have received byjus product since the tablet got discharged and i plugged in at night. Yesterday morning when i checked the tablet was not charged. I thought could be one of the electrical issue and ignored it. I plunged in again to get it charged to surprise as soon as i removed the charger the battery go drenched again in couple of minutes. Called byjus team for assistance and i was assured their team get it resolved in 3 hrs. But still waiting the team to revert but yet i don't see a sign of their effort. I have spent for the product but do not find it useful.
Please assist to get it resolved