Apple/iTunes will not send you a receipt immediately upon your purchase but rather within 2 to 5 days after a purchase is made. In addition to this the receipts will show all purchases made in that time period as a single purchase, joining them all together.

If you feel you were overcharged this is likely the issue, so please consider the purchases you have made during the course of the last week and see if the totals seen on the receipt now make more sense. If you still feel you have been charged for more than you have actually received please contact our support team for further investigation.