Email Contact for AT&T's DirecTV Stream?

I want to log a complaint to this company, but there is no way to do it in writing, other than by snail-mail. After having been a faithful DTV customer since 2002: satellite until 2017 when started streaming with Amazon's FireStickTV via AT&T due to overgrown trees blocking line-of-sight, and watching my viewing package pricing going up exponentially, I am just furious at them for this recent decision to drop one of the channels that we even went up in packaging services plans in order to acquire: OANN. When they do NOT renew the contract in April, I am dropping AT&T/DrirecTV Stream like the hot rock that it is. Enjoy gravity. It's yours. God bless you and your erroneous decision, DTV.