Disgusting service

The lady working at the Mc Donald’s drive on Saturday night the 16th of February 2019 20:40 is extremely rude. 1stly we arrive at the drive thru intercom, we say hello then she doesn’t respond. After placing an order she makes a mistake, then when I correct her she yells at us. How rude of her . As if we getting the food for free. We get there and she’s chewing a gum on a disgusting manner