First - a very warm welcome. You really have to be a little quiet now to make sure that hematoma or whatever goes away.
Check with websites like Verbraucherzentrale Nordrhein-Westfalen or Stiftung Warentest. You should not pay these sums. I am sure somewhere on the web you find the text of letters you should send to them. Normally there lawyers threaten but will never go to court as they will not win. I can understand that it is tough to be tougher than them but it is what all serious institutions recommend-
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