How to permanently delete 31,000+ messages from iCloud and reduce storage?

How to permanently delete messages from icloud

i have taken the following steps to delete the 31000+ messages stored in the cloud

• disabled Messages sync, Settings → "Apple ID" → "iCloud" → "Messages" → toggled off "Sync this iPhone".
• deleted all recently deleted on iPhone and iPad
• deleted data, Settings → "Apple ID" → "iCloud" → "Messages" → "Manage Storage" → "Disable & Delete".
• i then enabled message sync - to resync the last thirty days messages.
• all 31000+ return to iPhone and iPad

I want to reduce my storage down from 200 GB.

[Re-Titled by Moderator]

Original Title: Unable to permanently delete