I believe it was a mistake. Or some kind of bug, I don't know. Because, like you, I've never broken any site rules.
But as soon as I contacted the moderation team through the forum, they quickly fixed it. I suggest you do the same! Create a topic and ask for help.
Hopefully it gets fixed quickly, friend. It was hell while my account was restricted. (What the girl said also makes sense. It could possibly be a faulty anti-flood system that detected some word or something like that and restricted it by mistake... it's less likely, but not impossible.)