Well, it turned out that it wasn't a scam. I really did pay my VAT to Italy in 2015 1Q, three months late. I can't remember why, this was three years ago, but I have a feeling it was because the HMRC Vatmoss system wasn't fully operational yet.
I contacted HMRC, and they confirmed the late payment, and my records said the same thing.
So I've paid them, Well, it was only 65 euros.