I was refunded shipping as it was their mistake and they even offered me free shipping on an order over 400 dollars before the end of the month if I later decided to purchase something. Yeah I would be contacting them if I were you. Tell them that this is now the second time you know of that this has happened. A friend of mine said they were not good at updating stock quantities - which is very obvious!
Good luck miss!
they refunded my shipping!