Do Sri Lankan passports holders transiting via HKG but not changing flights need transit visa to HKG?

Example: I was booked on Thai Airways to travel to seoul on TG628 which has transit in HONGKONG for about 1hour at ground. I did not have to change any flights, but the AIRLINE refused me and told me that I did not hold the transit visa to HONGKONG.Please advice me if I need in this case. Many Thanks.