When buying online, the check out allows you to add multiple discounts and promotions to your purchase- never once does it say if they are incompatible or if you can only have one. It's only AFTER you complete the purchase, does it show the actual price you were charged (a far more expensive price, with none of the discounts you believed you were legible for). You cannot cancel this order. You have to be charged an amount you were not ready or expecting to pay, wait for delivery, then go through the ordeal of attempting to get a refund. Trying to get in contact with customer service during this time is a lesson in futility. Their customer online chat simply disconnects you when you reach 1 in the 'queue' about half an hour or more later, (which curiously always resets to 7 when you try to reconnect, as if there's not a real queue at all, and simply an automated service designed to wait you out)