To file a complaint with Expedia, you can contact their customer support by phone at +1-(808)-900-8011 or through their website's Help Center. Provide your booking details and a clear explanation of the issue. If your issue is not resolved initially, you can request an escalation or try social media or the Better Business Bureau (BBB). 
Here's a more detailed breakdown:

    1. Contact Expedia Customer Support:
        Phone: Call +1-(808)-900-8011. 

Online: Go to the Expedia Help Center for further assistance. 

2. Provide Necessary Information:

    Have your booking number, confirmation emails, and any relevant receipts or screenshots ready. 

Clearly explain the issue and the steps you've taken to resolve it. 

3. Escalate if Needed:

    If the initial customer service representative can't resolve the issue, ask to speak with a supervisor or manager. 

You can also consider escalating the complaint through social media or filing a complaint with the BBB or the Federal Trade Commission (FTC). 

4. Follow Up:

    If you don't receive a response within a reasonable time frame, follow up with Expedia to ensure your complaint is being addressed.