What should I do if the deposit fee of HK$ 1000 deducted by Hong Kong Hotel has not been refunded to me for almost a month?

First of all, through what channels should you inform the refund? Whether the merchant cancels the authorization directly or the merchant faxes the bank to cancel the authorization.

Generally speaking, you need to call the merchant to ask if there is any refund operation, because banks generally don't check such fine transactions for you. If the merchant can directly cancel the authorization, it can definitely be returned in 3-5 days. If you go through the bank, it depends on the processing speed of the bank. It is estimated that the processing will be slower on September 6th, just in time for the Mid-Autumn Festival, but it will take 10 working days. If you haven't received the refund, you should contact the merchant and ask them to handle it as soon as possible.