Neighbors connected via moca

I recently noticed on the Xfinity app that my neighbors have several devices connected via moca to my gateway. Not only has it slowed down my internet, but I also can't seem to keep the devices off of my network. I called Xfinity twice and was told to reset my password and network name. I use very secure passwords, and the devices reconnected. Although I have "paused" the devices, they still show up as connected to my network. After the second call, I requested that a technician come out to install a point of entry moca filter since I don't have one. The technician insisted the devices were not connected and reported no issues. He did not install a moca filter. I purchased one off of amazon, but I wasn't able to install it without impacting my cable service, which would get pixelated. I thought I had paused all of my neighbors' several devices, but last night I again received a text that a new device was connected to my network via moca.

I would prefer not to have to purchase a $300 router myself to avoid this issue. Is there any way to get Xfinity to assist with the issue and install a moca filter?