In Germany it would have been sufficient to ask for proof in writing with a return receipt. There's your paper trail. If they insist after that, threaten crimin

In Germany it would have been sufficient to ask for proof in writing with a return receipt. There's your paper trail. If they insist after that, threaten criminal charges. This worked wonders for me in the past. Additionally, loser pays (unfortunately, not for my time, though). This would never go to court. But you can't ignore it, that's true.