I bought an item at Stokes Black Friday event. The...

I bought an item at Stokes Black Friday event. There were flyers and signs all over the store, even at the cash register, advertising an additional discount when you scratch a ticket. When the cashier tried to enter the additional discount, she got a message saying the discount wasn't allowed. Neither of us could find anything that said there were any exceptions regarding the additional scratch discount. I've emailed Stokes three times and no one will reply.