Welcome to the forum. Is it just one particular device you can't connect, or no devices are connecting to the Internet? If you haven't already, power down your broadband router for a couple of minutes and then power back up again.
If that doesn't help I'd recommend giving the broadband team a call (free from your home phone) and they can troubleshoot you. You can find the telephone number by going to your My Account > My Package page
NOW are looking for users to join their Customer Feedback Group and help improve the service. If you're interested read more here and sign up.