Apart from the by now well known difficulties for withdrawing, I think they came up with another vector of undermining customer rights. Since I traded in for EUR in November, I requested account verification in parallel to this. The first reply took them 14 days stating the document is not viable, while it was an authority's edict with stamp, address, recently issued and everything! The same day I gave in, and sent them the needed albeit weaker document of a telephone bill plus a complaint that they are overdue with their service anyway. Formally it should take them 10 days to verify, not more. The last thing I got was a response that they'll forward the issue to the "concern department for better and quick assistance". What a hoax, I got nothing after that. I bumped my request upon their response, but nothing happened so far.

Here's the rundown:
15th Nov: Filing for authentication
29th Nov: Reply of temporary denying authentication and requesting another document
29th Nov: Uploading another document and urging them to keep their deadline
11th Dec: Reply that they forward the issue to the "concern department for better and quick assistance"
19th Dec: Me sending a message to urge them
... nothing more

This brings the whole procedure to a total of 45 days which should have been done within 5 days!
I'm on the brink to really get mad since no one is replying, they violate generous deadlines proclaimed by themselves. I don't want to see them go bottom-up before I can even start my withdrawal procedure... Did anyone experience similar issues and what is the recommendation to do now?