Neither your ISP nor anyone else can actually tell what you’re doing on the web . But they will follow the activity of your public IP address—the one your router uses to access the web . And if somebody else uses that address for unsavory purposes, you’ll become a major suspect.
As I’ve previously explained, your public IP address is quickly accessible on the web . Anyone can use it to get your general location (your neighborhood, not your house) and your ISP. Your ISP can identify it as yours, and can do so if subpoenaed.
So how could somebody else be using your public IP address?
It could very likely be someone you reside with. Everyone using your home network is using an equivalent public IP address. Have a really serious talk together with your family or roommates.
Another possibility: A neighbor may have hacked into your Wi-Fi network, and is now using it without your permission. you’ll stop this by changing your Wi-Fi network’s password and tightening your router’s security.
Something else to stay in mind: Most home Internet connections use a dynamic IP address. From time to time, your address will change. When your ISP accuses you of criminality , ask them how long you’ve had that specific address. Yes, they ought to have looked that up before contacting you, but we all know that ISPs often lack sterling customer service records.
Finally, it’s possible that somebody distant could actually be spoofing your IP using various type of IP grabber tools. Discuss the likelihood together with your ISP, and ask them to offer you a replacement IP address. If they comply, and therefore the criminality stops, you’ve solved the matter.