Pixelation issues Science Channel HD Flint Mi market

I have constant pixelation issues with the SCIHD (211) in the Flint area. I have had the entire house from the outside drop through my home retired by a cable contractor. Every time comcast is contacted it's well reset your box and if that doesn't work well send a technician out. It's always the same result we can't find anything wrong... Enoughs enough. Maybe a call to the FCC might get some action.. I'm fed up !!