Comcast automatically unsubscribing me from email lists without my permission

I am continuing to get unsubscribed from companies that I have not unsubscribed with. Comcast is sending unsubscribe messages without my permission or knowledge. Two recent examples include messages from [Edited: Personal Information] and from [Edited: Personal Information]   This has been happening REPEATEDLY OVER YEARS!!! When I contact list owners they say I have been unsubscribed. They resubscribe me only to have Comcast unsubscribe me over and over again. How can this be stopped????