If you need to complain about the credit card-related problems of Bank of East Asia, you can do so through the following channels:

1. Customer service hotline: Call the customer service hotline of Bank of East Asia for complaints and consultation.

2. Online customer service: Contact online customer service through channels such as Bank of East Asia, official website or mobile banking to make complaints.

3. Mail complaint: Send the complaint to the official mailbox of the Bank of East Asia, and wait for the customer service to reply.

4. Complain at bank outlets: If the above methods can't solve the problem, you can complain at Bank of East Asia outlets.

5. If you encounter problems related to the Bank of East Asia credit card, you can complain through various channels and choose the most appropriate way to solve the problem faster.