State your complaint, the solution you want, including your deadline for resolution and what action you're prepared to take if they are not willing to resolve your request. Confirm what they say by repeating it before you hang up. If they are not willing to resolve your complaint, ask them for the name, title and mailing address of the individual they report to. Do it in person Making your complaint in person is one of the most effective ways for you to get quick resolution. Get action from the top.
Personal confrontation is always powerful.
Use it to your advantage. State your request clearly and simply. Know what you want and be prepared to take your next action if they cannot meet your request. Your meeting may be in an office or conference room, but if you see you're not going to get any satisfaction, move to a more public place. Take notes while you talk.