It will be 5 weeks of your salary as of 31 DEC plus HK$6,000 minus the DOLLAR AMOUNT you received in August.
OK. Got it!
I guess I have been working for this company for too long. Knowing too well what they are like, I have learnt to always read between the lines, read all the fine print and always assume they are NOT going to honour their verbal promises unless it is in black & white.