I recently stayed at the Hilton San Diego Gaslamp. While the room and location were, respectively, excellent and good, I was truly annoyed by a simple receipt issue. I specifically requested the receipt to be emailed to me. I'm surprised that such a basic issue would require webpage messages (which I completely ignored), multiple phone calls (with long wait times), and lengthy emails. It is unacceptable for Hilton to be unable to handle such a basic billing issue, which I had already experienced at another Hilton property overseas. It seems Hilton has lowered its customer service standards.