I became a customer of YouSee 2-3 weeks ago.
Last week, i received a very convincing phising e-mail. I almost fell for it.
The timing is very suspicious, since I have never received a phising mail from YouSee before, but this one arrived a couple of days after the deadline for the 1st bill.
This is super targeted to be random.
It definitely looks like a potential leak of the customer database. I would recommend starting an investigation, possibly for internal actors.
I hope this helps protecting fellow customers.