[Resolved]  Byju's — tab not working

The tab got delivered to me last week and i have been using it since 4 days and the tab is not working properly. The tab keeps on stopping mid way of the videos. Some of the videos are not working. Some are inaccessible which should not be the case because i paid the whole amount all at once. The point is i have paid the whole amount and my tab is not working. Kindly assist.