Hi! I understand you've purchased the Aarambh batch on the Next Toppers app but are seeing a "data not found" error. Let's get this sorted out for you.

First, can you tell me:
- Are you logged into the app with the same account you used to purchase the batch?
- Have you tried logging out and logging back in?
- Is your internet connection stable while accessing the app?
- Have you already tried any troubleshooting steps like restarting the app or device?

This information will help me guide you better. Meanwhile, here are some usual steps that resolve this issue:

1. Check your login credentials: Sometimes if the app doesn’t recognize your purchase, it could be because you are not logged into the correct account.
2. Clear app cache:
- Go to your Android Settings > Apps > Next Toppers.
- Tap on Storage.
- Tap "Clear Cache."
3. Logout and login again: This can refresh your session and pull the purchase data properly.
4. Update the app: Ensure you are using the latest version of the Next Toppers app from the Google Play Store.
5. Check internet connection: Use stable Wi-Fi or mobile data.
6. Restart your device: Sometimes a restart helps the app function smoothly.

If after trying these you still face the "Oops! Data not found" error, it could be a known issue from the app's side recently reported by several users especially related to Aarambh batch purchases. There are videos and threads about it — for example, this YouTube guide and some Reddit discussions suggest the app developers are addressing the problem.

Please try the steps I shared and let me know what you find. If the problem persists, I can help you escalate this to higher support or track any ongoing fix from the developers.

Are you able to try these steps now?