dropbox 被限制下载了

This email is an automated notification from Dropbox letting you know that your Public links have been temporarily suspended for generating excessive traffic. Upgrade your Dropbox account today to increase the total amount of traffic your link and file requests can generate. Upgrade your Dropbox! For more information on suspended links, please visit the Help Center. Your current account bandwidth limit is 20.00 GB and your current usage is 20.30 GB. If this is your first suspension, you may remove the suspension by clicking this link otherwise please visit the Help Center. Happy Dropboxing! – The Dropbox Team 免费的账号都有20G的流量限制？？