Xfinity box fried my TV

Last night while watching my TV, all of a sudden there was a bunch of crackling noise, the screen froze for a few seconds, the screen then displayed a bunch of colored horizontal lines, and finally the screen went black.  I turned the TV off and on again.   The power LED light comes on but the screen is dead; nothing displays.  It is not a situation where it isn't receiving any input signal; the screen is dead.  Even without an input signal, it should display the TV setup/input settings/menu.  I then noticed that my cable modem was indicating that there was no service.  I went to Comcast's website and found a notice that maintenance was being done during this time.

I am as sure as possible that the maintenace caused some voltage or other damaging signal to be sent from the Xfinity box through the HDMI cable and fried my TV.  I have researched that while this is not a common occurence, it is possible.

I contacted Comcast but they refuse to acknowledge not only that their equipment damaged my TV but that it is possible for this to happen.  The likelihood of this being a cooincidence that my TV screen burned up at this exact moment is infinitesimal.

I would like to escalate this to whoever is appropriate and file a damage claim.  Has anyone else had a similar experience and received any compensation from Comcast?