It is impossible to e-file a return that has already been e-filed, and it is also impossible to e-file a 2016 return. It will be rejected; in fact there should have just been an error message for it. You are posting from desktop software so not sure what money you think you should be getting back. If there was something entered on that return about paying, then fear not-- it is not going to go through, so nothing you entered on it is going anywhere including any payment information.
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**