So... after yet another phone call to try to solve the issue mentioned here, I finally talked with someone who admitted that the e-mail account has been hacked.
Since the exact same day, a lot of people have been complaining of the exact same issue, buuuuuuuuut... our provider says that it's our fault. Yea. Of course, the whole lot of us... from the same moment.
When I mentioned the possibility that they had been hacked to the IT bloke, he went "No, Ma'am! That's absolutely impossible!". Yea... but back in September, they had to admit that they'd been targeted. Why wouldn't it be the same this time??? "No, Ma'am! That's absolutely impossible!"
Whatev'.
There's no shame in being targeted by criminals, and since it took them thirteen days to admit that the account had been hacked, I'm not inclined to believe them about the origin of the hacking - sorry, guys!
Now, the next stupidity from them (unless the IT person who's going to read our online SOS/message does not have soup between the ears) is going to be the hopping through loops to get control of the account again. It really looks like DIY à la MacGyver to have to send a registered letter with proof of identity and new address because the "old" account (that they fucking have in their archives as the original e-mail account with the "old" address on file) is not fully linked to the new account. "We've got everything, but we're going to make you suffer whilst we're the ones with two left hands."
I hope to deal with someone with more than three brain cells in the box above its shoulders...
I'll keep you posted...
See you next year! ^_^