Typical from LH. In fact I would be shocked if they didn't serve you a lie to make you go away. It is pretty bad; enforcement in Germany is too soft and honestly ... mostly absent.

Such a behavior would certainly not be tolerated by the US DOT.

I would reply and correct 'the clerical error' and 'hope' for a better outcome ... brace for the worst and more trouble to come. I am still waiting to have a September 2022 downgrade from F resolved ...