Vector Store file delete is not removing the file from vector store

Adding one more thing: are you checking the vector store file object specifically or the underlying file object?

From the docs, files can be removed from a vector store either by deleting the vector store file object or by deleting the underlying file object. Deleting the underlying file object removes it from all vector store and code interpreter configurations across assistants/threads in the organization.

Docs:

developers.openai.com

Assistants File Search | OpenAI API

Use File Search as a built-in RAG tool for assistants.

So if it still appears specifically in the vector store files list after waiting/retrying, that may need Support/staff to inspect. But if it appears elsewhere as a file object, that may involve the separate file delete endpoint.