Write an article based on this "Prepare for the phone call. Communicate the problem. Decide whether or not you want to change your wireless network password. Ask the support agent to recommend the right security settings for you."
Gather information that the support agent will need to verify your identity, such as your account number or billing address. Tell the support agent that someone is using your wireless connection. If your wireless modem/router came from your ISP, they can log into it and remove unauthorized users. If you think someone is using your password, ask your support agent to configure a new one at this time. Remember, passwords are case-sensitive. If it's been a long time since your router has been updated, your support agent may also take care of this now.