Whom to talk to depends on what "lost return" means. And please confirm if you are referring to a "return" as you mentioned or if you meant to say "refund." Please provide some details, and folks may be able to tell you what to do. For instance, if you can't find an online return you prepared, we can tell you how to troubleshoot multiple accounts to locate it. That's a common circumstance.
Or you can phone TurboTax Support during business hours and they can question you.
