FIND A BETTER REWARD/SURVEY SITE.
I have been a loyal and thoughtful member of Swagbucks and I have to tell you that there has been COUNTLESS times that I spent an hour or even more and either didn't get the promised swagbucks or got an error message after I completed the entire survey.
If you submit a "help ticket", even if you provide proof in the form of screenshots they send you a generic email saying "As you know, we work directly with our partners to ensure completions are tracked in the system. Without a confirmed completion from the 3rd party, we are unable to continue to fully crediting your account going forward. Understandably, it is frustrating to receive this news after investing your time.
Our goal is to ensure you have the best experience possible when completing these activities in the future. In order to do that, we are sharing your feedback with the team in charge as we continue to receive it.
Please continue to share your feedback with us and thank you for your understanding!"
Basically your out of luck.