I have stayed in one of the Hilton hotels in Thailand. It was the end of low season and start of high season. The hotel was half empty! I booked the second best suite and hoped to get upgarde to their best suite. When I checked in I asked for the upgrade. The person at the reception in the club floor just told me even a Diamond member booked the second best suite would not get the upgarde to the best suite! So, after I checked out. The hotel ask me to fill out a survey. I just put whatever the person told me on there. Then, the hotel manager reply back and said their best suites were not available! I sent a reply back to him and told him the suites were available because I checked using the Hilton app before I checked in. He didn't even bother to reply me back!

Do any of Diamond members here have similar situation? Anyone knows about Hilton's policy about the suites upgarde?