I approached the young lady at the far end of the check in desk, handed over my $20 sandwich, made some small talk, then asked if there were any complementary room upgrades available. She told me she could move me up to a King Deluxe room for an additional $15 per night. I told her I had booked a King Deluxe. She told me their system had me down for a Dual Queen Deluxe. I questioned a bit more, then reluctantly accepted. I did not get my $20 back even though the service I tipped for did not occur. I called the front desk the next morning and explained the situation. The supervisor apologized and waived the upgrade fee.