If you want to make upper management aware of your situation and/or file formal complaints with United and/or the United States Department of Transportation then this should help:
If you want to file a formal complaint with United please make sure you do it through Customer Care and using this form:
Please note that the minimum response time to hear back from the Customer Care team is 3-5 weeks (depending on status) for domestic flights and 30 "business days" for international flights, so don't expect an immediate response. Make sure if you do file a report with the CC team that you get a CASE ID NUMBER as the CC team should send an automated response confirming receipt of your report.
Within this receipt there is a Case ID number and without it United will tell you to please submit your request again.
If you submitted a complaint and “didn't” get the automated response with a Case ID number then check your SPAM folder to see if it was diverted there instead of your In-Box.
NOTE: if the link above is having issues and doesn't allow you to submit your complaint (which happens frequently) then use the following email address: CustomerCare@united.com
Even if you do use the email address you should still get an automated response with a Case ID number.
NOTE: due to the grief and hassle United put you through you may also want to ask for a "Goodwill Gesture" in your formal complaint. The screenshot below from a frequent flyer that appeared on United's Facebook page explains why you ask for a goodwill gesture instead of compensation.
You should also make sure to file a complaint with the U.S. Department of Transportation's (DOT) Aviation Consumer Protection and Enforcement agency and this is why:
All complaints are entered in DOT's computerized aviation industry monitoring system, and are charged to the company in question in the monthly Air Travel Consumer Report. This report is distributed to the industry and made available to the news media and the general public so that consumers and air travel companies can compare the complaint records of individual airlines and tour operators. These complaints are reviewed to determine the extent to which carriers are in compliance with federal aviation consumer protection regulations. This system also serves as a basis for rulemaking, legislation and research. Where appropriate, letters and web form submissions will be forwarded to an official at the airline for further consideration.
Complaints are broken down into 3 categories: Safety and Security Complaints / Airline Service Complaints and Comments / Disability and Discrimination Complaints and you can reach all 3 at this link:
You have 3 options when it comes to submitting a complaint: you can call, write or use their web form.
Want another way to give feedback to United? If you go to the airline's United Hub web page - https://hub.united.com/ - top center of the page is a tab called: "We're listening"
Clicking on this tab opens a dialog box that says:
"We invite you to use the form below to either ask us a question or submit an idea. If you would like a response to your submission, please provide your email address below. When you are done, please press the share feedback button. For customer service or other inquiries about your travel, please contact Customer Care at united.com/feedback, or find us on Twitter @united."