Really bad experience at KFC lucky one mall,

Availed QR code master scan offer for zinger and drink at 150rs, customer can avail this offer and can do multiple transactions but the manager and staff refuse to do multiple transactions and misbehaved, when i called the call center they said yes you can do multiple transactions and avail this offer, but manager was not willling to entertain me and was very rude like he is giving me free burger from his pocket, i donot understand why the staff always do this kind of act when any offers are on. i request the #KFC PAKISTAN to take strict actions againts all the staff like him.