What can I do to stop phone calls that are supposedly coming from my home phone to my home phone? I tried to block them but not allowing me for obvious reasons. How is someone able to shadow my name and number like that?
Since Comcast won't let you block your own number, there's nothing you can do without resorting to 3rd party hardware. Scammers can easily fake their caller ID, and using the number they're calling seems to be a popular trick. For more information see any of the many article links at https://www.google.com/search?q=caller+id+my+own+number, for example https://www.consumer.ftc.gov/blog/getting-calls-your-own-number.