Grouped Files are completely missing

I made a new note and suddenly all the other notes in groups in that specific folder had suddenly vanished, not in the trash or another folder, completely gone for good, even on the web version. What happened and please how can I get these files back they contained years of work I need them back as soon as possible.

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Migrate your Notebook data to the new, mobile Notebook.
Zoho Notebook is transforming. The new version will include exciting new features and a completely new user experience. The initial version will be mobile based, available for Android and iOS. A new web version will be available after the initial mobile release. With the release of the new Notebook approaching, we're migrating most of your current data to the new version. Once the new version is released, there will be an additional window to migrate your data. We will not provide access to the