Logging in to the gateway router to find my neighbor’s information.

This has never happened before, and I’m pretty angry because as per usual, we can’t get in touch with someone who works in the United States, who’s has been properly trained on technical issues regarding WiFi. This is why people hate Comcast. But I digress. 

Lately I have been having issues with my internet, and it says all of these random people are connecting to my wifi. I’ve had to pause them all because I don’t know what’s happening. I changed my passwords, changed my wifi names, etc. I logged into my router, 10.0.0.1, and it kept saying my password was incorrect, I finally fixed that and logged in. It brought up my neighbor’s information. Not mine. I was so frustrated I drove down to Comcast to ask them [Edited: "Language"]. I know they can’t diagnose while I am away from my router, but they did assign a tech to me, so I may have an answer in the next day or so? The guy at Comcast says “You may be sharing a coaxial cable??” This has never happened. How could we be sharing a cable wire? 

Please help!!! 😫