due to Facebook login going away -- I'm not able to access my data

Hey guys,

I used to log in with Facebook, for over a decade. My main use for IMDb is my Watchlist. Today, when I tried to log in, I saw that FB isn't supported anymore. I went through the process of linking it with my email, but once I did that - it linked with another IMDb account which had only 9 items in my Watchlist. 

So this is a merge bug. Here is the issue -- I'm not able to get back into my account which had the 400+ watchlist since the email that was tied to it (via Facebook) also existed as an email with IMDb. When the linking happened -- IMDb reverted to my tiny account vs. my super old account. 

I know that my data isn't lost because when I try to change my automatically created username to the one I know that had the large Watchlist -- it says the username is already taken. So my data is still on the servers. But I can't access it.

Basically -- I need to be able to log in with my old username (at least once), but not able to, since IMDb only accepts email addresses now. 

Thoughts?