So you have two options to remind people to complete the survey. One option is to resend the survey invitation. This is a good option because it only sends to people who have not yet completed the survey. Unfortunately, I don't have the ability to change the content of the message to increase the call to action. For example, I can't send an "Only two days left" email only to people who haven't completed the survey. If I choose to make a copy of the survey invitation in order to edit the content, it sends to the entire list, rather than those who have yet to complete the survey. Obviously a tool which combined these two options would be preferable. I would like to send a reworded message out only to those people who haven't completed the survey and need more direct prompting.