Hardee's Restaurants

Came to the Hardee’s on Turner McCall Blvd in Rome, GA. Promotional placard said sign up for Hardee’s app, spend minimum of $1, and you get a sandwich free. When I told the girl I’d like to do that, she replied “I don’t know how to do that”. I said “could you ask someone”? I signed up for the app, got the app. Three employees didn’t know what to do so the manager said “just give to them”. Why would you have a promotion and not train staff to process it?