I had a $10 discount that I was able to apply to my last shipment due to a very late delivery on my previous order. This discount was accepted when I placed my most recent order. However, I was not able to take advantage of the 20% discount that your company was advertising because I had applied the $10 late delivery discount. Why was I penalized for using the $10 discount that was originally granted by your company due to a late shipment? A late shipment discount should not prevent me from using an additional discount. Your system would not allow me to enter more than a promotional code.