Can't access Internet despite 'you already have data'

Question

So I can't access the Internet, my browser automatically redirects to a page that tells me that I already have data and that I still have some left but yet won't let me do anything on regular internet.
We ran out of data last week and bought a 10GB add on, but our usual allowance was reset on the 20th (We bought the add on on the 18th) so we definitely should have Data left, as we pay for 50GB a month.
We're on a 4GEE WiFi Plan.
anyone that can help swiftly with this would be appreciated!

Answer 1

Your initial assessment sounds accurate; you've got a good signal from the router, but something else is preventing access to the Internet.
Most Linksys routers provide web-based management. With the default configuration, you should be able to enter the URL http://192.168.0.1/ and see a password request. If you don't see this, you still have problems between your computer and the router.
With the default Linksys configuration, leave the User Name blank and enter 'admin' in the password field. If this is the first time you've set up the network, you might want to visit LinkSys and find the User's Manual for your model router, and follow its advice about setting up the router. If you've already done this, the router's Status page should tell you whether it has a WAN IP-address and is connected to the Internet.
If your router is set up and on-line, and you're still having the same problems, it's possible that your Mac's TCP/IP configuration isn't quite right. Open System Preferences > Network > TCP/IP and set it to obtain its IP-address automatically; and you might try entering the router's LAN IP-address (198.168.0.1 by default) as a DNS server.
Let us know how it goes!