Does anyone kmow how to block an IP

[someone]

I can tell you the firewall does not work, also suricata does not work in blocking certain IPs.
How does an IP bypass the router altogether.
If you can answer without getting in trouble, if you can answer you know already.
i could go into more detail but Im trying to stay out of trouble.
I have a vague idea how they are doing that, but my question is, is there a way to stop them, block them.

Another note, its a new installed system so there is no carry overs do to any malicious bad guys
So all the planted and in planted ways to cause a connection are not relevant in that respect.
No Im not going to bad websites of any kind.
I dont use tor. or vpns, you should know about that already
Not sending encrypted messages, no dark web