Messed up how? Did you forget how to log in to your account? Accounts cannot be merged or combined, so you need to choose one and stick with it.
Many people have multiple TT accounts and forget how to access them. Log out of the account you are in now.
Or did you use the desktop version of TurboTax? If so, the files are on your own hard drive or any backup device you used like a flash drive.
To call TurboTax customer support
They are available from 5 a.m. to 5 p.m. Pacific time.