I've received the email:
"We’ve been notified by a third party that a device on your home network has participated in a Denial of Service attack, which is where a computer system sends a large amount of traffic to another computer system or network with the aim of disrupting its connection to the Internet., etc etc"
Obviously includes ZERO clues about this alleged DDOS participation, no information about the ports used, device, logs, anything whatsoever to be able to trace the issue.
I have a dozen of devices connected to the WiFi router, including but not limited to computers, smart devices, etc. None of them are having security issues that I'm aware off, and at least on computers, no malware was identified by the antivirus...
The link given in the email only provides information on what to do if you are the target of a DDOS, not if you are the one doing it, so that link was really ... useless.
The one thing that's strange however, is the fact that my IP address (that I had for years) only just changed few days before the alleged DDOS participation date. If I'm to guess here, whoever had the IP address before me is likely to blame, and the date they given me is just the date they received the information or whatever.
I honestly have no idea what to do next, the email treatens to cancel my services if I don't fix my issue, an issue I'm certain I don't have.
If anyone has any advise, I'll appreciate.