You are right. The rep was incorrect in what they told you. ALL that Dish gets from the OTA antenna (PSIP) is the station's call letters or some "code" that's in that data. Dish then copies the guide data they get from Tribune or whoever and maps it to the OTA channels.
Dish is the one doing this, regardless of what they tell you. They're doing this to cause an "inconvenience" to the viewer of this station in hopes that you contact the station to complain. I'm surprised they don't include the phone # and name of the general manager of the station....