HK Immigration Investigation & Name / Nationality

I am a former participant of the Capital Investment Entrant Scheme and have since obtained Hong Kong permanent residency. The Immigration Department is now conducting a further review in relation to my application history specifically involving:
1 historical use of English and Chinese names in different application stages
2 Questions concerning nationality status and travel documents at the time of application.
The matter is currently at an investigation / clarification stage. And I have received a formal request from the immigration Department for further explanations and documentary evidence.
Given the complexity of the case including name history, nationality timeline, and documentary consistency - I would like to seek professional legal advice on how best to respond and ensure full compliance with HK Immigration requirements.