To help us effectively conduct a fair and reasonable assessment on whether follow up action applies, complainants are invited to fill in (1) the Online Complaint Form , or (2) a specified complaint form and send it by one of the following means:

by post to: Market and Competition Branch
Office of the Communications Authority 29/F, Wu Chung House, 213 Queen’s Road East, Wan Chai, Hong Kong.
by fax to: 2123 2187
by email to:


Alternatively, the complaint form is obtainable through our fax-on-demand service, please call 2961 6333 and press ‘9’ for “Information by Fax”.

In case you have difficulty in writing, you may contact us by calling 2961 6333 (from 8:30am to 5:45pm, Monday to Friday except public holidays). Our officers can help fill in the report form for you. To ensure accuracy, the completed form will be sent by post or by fax to you for your confirmation and signature.

For enquiries, please call 2961 6333. After selecting your preferred language, please press ‘7’ for TDO.