How can I lock my internet / WiFi so people just don’t log on without permission
Are you saying they are using your SSID/password?
Ladybangs, thanks for posting! I would recommend following the instructions Robertwy posted. If you have changed your password and you're still getting unwanted wiFi usage, let me know.
Ladybangs, thanks for posting and I'm sorry you're experiencing what you believe to be hacking. I highly recommend you reach out to our customer security assurance team. They are a dedicated team that works with customers who may be victims of hacking or data theft. Please reach out to them here: 1-888-565-4329, 6:00 AM - 2:00 AM ET/Seven days a week. You can also visit https://internetsecurity.xfinity.com/help/report-abuse/ to learn how to fortify your account and network.