The first thing you need to do is add yourself to the Do Not Call list. You can do that on this site https://www.donotcall.gov/
DIRECTV:
It looks like now that AT&T owns DIRECTV NOW you can ask to be put on their do not call list by visiting their website but if you want them to stop mailing you need to contact them.
Comcast:
Comcast has a website just for being removed from their mailing list. You can find it here https://pc2.mypreferences.com/Comcast/OptOut/Default.aspx
AT&T:
You can find out how to be removed from their lists here: http://www.att.com/gen/privacy-policy?pid=22975
I will be adding more companies as I find out how to get removed from their lists.
Centurylink:
All you have to do is go to this site and fill out the form. http://www.centurylink.com/help/privacy/optout_en.html
Dish:
TWC/Charter/Spectrum:
You can be removed from Charters, Spectrums, and TWC mailing lists here: https://www.spectrum.com/browse/content/remove.html
Cox:
We could not find any website to stop getting spam from Cox Communications. As best we can tell you need to call Cox and ask to be removed. You can contact Cox Communications at 1-800-818-0679.
If you have a company you want help getting removed from their mailing list please post it in the comments. I will do my best to find out how to get off their list.
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