AMPM.com review: customer service

Am pm advertise the scratchers to win free things while checking in. Today I went to the am pm on candlewood and paramount to get my free cookies. The cashier was rude while doing the transaction, but what pissed me off was the fact that at the end he told me I'm not allowed to grab more than on item next time. Then I informed him that the rules said I could collect up to 4 items. He said that it doesn't matter onluly certain customers can collect on the scratchers like that. Now he not only been rude to me and also made it be know that I wasn't one of his important customers.