Thank you PinkElephant. Yes, I am sure it wasn't me since I was not using my phone or computer in that range of time.
I discovered it since EN was showing messages continuously about about my reached maxinmum number of devices, which is fur, but actually I'm using just two devices.
I know that hackers use VPN so they could be near me even if they appear to be in another part of the world, and I secured my account immediately.
However, IMO it is not so fair that, in order to receive help after a DATA BREACH we would need to pay to know something.