Hi @3P Tiqri Shaamil Welcome to Microsoft Q&A thanks for posting your question.
I understand that you are getting an error when copying from database as A database with the same name already exists on this server' and you can see in the portal the database has been deleted.
I would suggest you can try renaming the database to a different name first and then changing it back to the original name after the import is done.
You can try importing from portal or PowerShell to import database: PowerShell: Import a BACPAC file to a new database in Azure SQL Database - Azure SQL Database | Microsoft Learn
New-AzSqlDatabaseImport (Az.Sql) | Microsoft Learn
If the above steps don't resolve the issue, you can try contacting Azure support for assistance. They can help you troubleshoot the issue.
Regards
Geetha