Interesting how so many people are answering that they've had trouble!
How about I look at some of those cases? Especially if it's relatively recent, I can take a look. Leave me a message here, or at my email address (see my HN info) , or on https://en.wikipedia.org/wiki/User_talk:Kim_Bruning
I'm not very active anymore, but I'll check in the next couple of days and see what I can do. Really to be able to help I generally need links to revisions, but if you have a username, a page, and a reasonably short time frame (a concrete date) I might be able to figure out the relevant revisions from there.
To onlookers: When I investigate cases like this, there's often a "catch." Sometimes contributors really did break Wikipedia policies — and just don’t mention that part when telling their side of the story.
Now I'm certainly not saying every case is like that, so I will look, and if you don't get what the issue was, I'll try to explain. In some cases if it was recent and it somehow wasn't fair, I might even be able to'fix' it within the bounds of Wikipedia policy.