First of all, we can't blame the users; they're just following the instructions on the help page. They don't know our rules; that this is a Q&A site and not a discussion forum. By the way, this page doesn't even list customer support questions as off-topic. That's probably why they post the same question multiple times, and 'me too'-non-answers. Coincidentally, this user even managed to accept the duplicate I suggested.
Note that it also could have been a possible troll; we had a similar situation in the past with this question where somebody posted a lot of anonymous (non-)answers (with separate names) stating that they had this problem too, in various ways.
Flagging the questions as off-topic is correct; it's harder to flag them as duplicates because that's only possible if the target has an upvoted answer. The ♦ moderators are already notified (via this meta-topic, and via chat) and will deal with the mess here; we're also reaching out to Cognito Forms to adjust the widget on their help page.
In the meantime, the flood of posts has dried, so the service is probably working again.