Bad management and Rude

I booked this hotel for 5 nights from 31 check out on 5 January only to found out one of my T-shirt is missing.the T-shirt is from saint Laurent cost 15k plus I reported the issue immediately with the gentleman who was working at reception on 05.02.2022 till today I haven’t got help it’s their responsibility to found out what happened to my T-shirt because only myself and your staff members had access to my room and I was hardly at my hotel room because I went to Cape Town to have fun I booked hotel just to sleep and put my valuables but the cleaning ladies was cleaning my room everyday ,I am extremely disappointed on how they handling this issue considering that you’re a 5 star hotel. One of the cleaning lady confirmed she saw my T-shirt on the 01.01.2022 while she was cleaning my room and she told they guy who works at reception by the name of linden (if the spelling correct) And the management of the property just rep**** and said who can ***** a piece of cloth the T-shirt worth 15k plus unfortunately the direspected me to that point and shows no principle at all ,if you can check on booking.com how the person once more reply to guest reviews with disrespect shows you once you check out they don’t care . All I want is them to take responsibility and pay my T-shirt and apologise for disrespecting me as client.