To escalate a problem with Expedia, first, contact Expedia's customer service at 1-808-900-8011 or 1-808-900-8011 and request to speak with a supervisor or manager. If the issue remains unresolved, you can submit a formal complaint via the Help & Support section on their website or through a customer service portal. Additionally, you can use live chat or email support, or consider using social media to raise your concern. If necessary, you can also file a complaint with the Better Business Bureau (BBB) or the Federal Trade Commission (FTC). 
Here's a more detailed breakdown:
1. Initial Contact & Escalation:

    Phone: Call Expedia's customer service at 1-808-900-8011 or +1-808-900-8011. 

Supervisor/Manager: When you call, ask to speak with a supervisor or manager to address your concern. 
Documentation: Have your booking details, receipts, and any supporting documentation ready. 

2. Formal Complaint:

    Expedia Website:
    . 

Visit the Help & Support section on the Expedia website to submit a formal complaint. 
Customer Service Portal:
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Many companies have a dedicated customer service portal where you can submit complaints and track their progress. 

3. Alternative Channels:

    Live Chat or Email:
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Expedia's website also offers live chat or email support options for faster assistance.
Social Media:
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Some users find success by contacting Expedia on social media platforms like Twitter or Facebook, as they may respond more quickly to public complaints.
Dispute with Bank:
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If you believe you've been charged incorrectly, you can dispute the charge with your credit card provider.
Consumer Protection Agencies:
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If all else fails, file a complaint with the BBB or FTC.