Clearing the source cache?

Has there been any update on this? I would really, really like to be able to clear my source cache. I have a ref that I accidentally pushed called, for example, folder/file. I realized I really wanted folder/file/test, so I deleted folder/file, but since git has some intricate treatment of branches with slashes in their names (which I was not aware of at the time), I am unable to fetch the folder/file/test branch since circle is seemingly caching the ref to folder/file. Renaming the branch isn’t feasible since we use branch names as a way to figure out where to deploy (staging, production etc).

Help?

Thanks!