Well, it depends on how you define (un)satisfied.
One possible way may be to say: everything that differs significantly form a certain value, I call significantly (un) satisfied.
For instance, is the scale goes from 1 to 10, the mean is 5.5 .
You could argue that when on a certain question they differ significantly from 5.5, they are significantly (un)satisfied.
If this is the way you want to go, you can use a one-sample t-test with 5.5 as the test value.
If this is not how you want to define it, you should indicate here what you mean by "significantly (un)satisfied", and we can go from there.