When i regained access i found the same as yourself, the whole account was in spanish with 5 pin locked accounts! i've now deleted them all and changed it back to my name etc. I then called Netflix and to their credit were very quick to sort the issue and transferred the account back to the correct email, you'll need the service code off the recovery page to help though. I logged into my netflix to find there was no active account, after a call with bt i went to bt.com/bttv/netflix to try and recover the account to find a random email address as the account email.
I've had exactly this issue, my account was switched to premium at the end of august which i switched back and then again today it was switched back which triggered me to look into it.
