How do I talk to someone in United?

Prepare Before You Call
Before you dial make sure you have all relevant information at hand. This includes:
Your account number or customer ID
Details about your issue or question
Any previous correspondence or reference numbers
Being prepared helps you explain your situation clearly and can speed up the resolution process. Be Polite and Patient
When you call it\’s important to stay calm and polite. Customer service representatives are there to help, and a friendly attitude can go a long way. If you\’re put on hold, be patient. It\’s common for call centers to experience high volumes of calls

Source: https://developer-community.sage.com/topic/10263--/