Uploaded files for fine tuning never finish processing (after a week)

I uploaded a file for fine tuning using the python API and I can see that it has uploaded successfully - the status is shown as “succeeded” (using openai.File.list()). But running openai.File.wait_for_processing(file_id) never terminates, even a week after uploading.
trying to start a fine tuning job

openai.FineTuningJob.create(training_file=file_id, model="gpt-3.5-turbo") 

results in the error “Resource not found”.
Any ideas how to solve this ?