If it's an emergency, please call the airline.
Things to consider:
- Be patient. You may need to hold for a long time.
- Be kind. Agents are humans , too, and good manners will get you much further than being angry and bitter.
- Call back if you didn't get an answer from the first try. The level of experience of the agents vary and you may want to try to call again when the shift changes.
- Do remember that not all airlines have good English service. Ask them to speak slower. If this doesn't work, then try their London office or any of the US offices.