Accounts cannot be combined or merged. Contact customer service for a deactivated account.
Here is a TurboTax FAQ for contacting customer support.
The other account can be reactivated but you will have to contact TurboTax support to start the process.
TurboTax accounts cannot be merged or combined.
Support is open from 5am to 5pm Pacific time, Monday thru Friday
Use this website to contact TurboTax support during business hours - https://support.turbotax.intuit.com/contact/
Support can also be reached by messaging them on these pages https://www.facebook.com/turbotax/ and https://twitter.com/TeamTurboTax