A tip for nerds like me: In situations like this, try to act like a real person. Support people especially have to deal with endless streams of annoyed, angry, or abusive people who will treat them like dirt. Anyone who's worked in a grocery store, etc will know what I mean.

Something like "Hey, thanks for looking into this, but I am very confused -- It seems like I was banned due to a software glitch. Would you mind double checking why I was banned?"

Boom, you've turned it from an unhappy angry interaction into a mystery they might be inclined to pursue. I've seen this technique work wonders.

And sure, you could argue that it's their job, so this shouldn't matter. But it seems to matter a lot, at least in my experience.