Playout (not feed-out - my mistake) providers are companies that provide the service of receiving, storing, and transmitting the program material, commercials, and EPG data for the networks.
In the analogue days, each network had their own broadcast facility, where they had staff to cue the various content, and other staff to operate the broadcast transmitters. Now that everything is digital, some or all of these activities can be outsourced to other companies. For example, almost all Australian TV broadcast transmission is handled by Broadcast Australia, and in NSW, MediaHub provides playout for the ABC, Prime, WIN, and others.
As a TV viewer, if you have an issue with incorrect EPG data, you should complain to the relevant network ("TV channel").