I bought a MacBook Air with upgraded specs on student pricing and the total came up to $1,500.58. I just checked my bank account and they only took out $110, why so little? The thing is I only have $1,504.87 in my bank account so will they charge me more then the "total" was? If they do, what should I do? Will they not send me the Mac because I don't have enough money in my bank anymore??