Expired Product

There is this snack at Clicks tht i adore the Popped corn and peanut caramel flavour-so i sent a message on FB last week to note that the goods was expired and not even a phone call to say we're looking into this matter i should have know that this was old but couldnt pass up the snack and the staff should have said the goods is over the expiry date what do i do in this case