15% Discount failed after order confirmation

Hello all. I just bought an X61 last night. I used the 'USPSUMMER' code to get the 15% discount. At the final order page, it displayed the discount and the correct total price. A few mins later, I received a confirmation and saw that the discount didn't go through. I checked my order status...same thing. Called Lenovo support today and heard that this is a common thing. Rep noted it down and said that once my x61 ships out to call them and notify them of this issue. They would do some sort of 'price protection' and issue me the credit. The odd thing is that I went through fatwallet for the additional 4% cashback they are offering and the recorded purchase they have entered is for the lower discounted total. Has anyone else had this issue?

 

I have had this issue, though not through fatwallet. I called Lenovo and they said the same thing. I emailed them with the information once my order shipped (I took screenshots of the checkout page showing the low price) and I received credit in 5 days.