wifi not working

Level 2

wifi just stopped working today. 4 lights come on but no devices are getting a signal. been on hold on the phone to TPG for over half an hour. can someone help?

Level 12

Which lights are on?

Is the wifi light or the 2.4G/5G lights lit?

Can your wifi devices detect your wifi router? What signal strength are they getting close to the router? 

Have you tried turning the router off and on?

Do you have a computer connected by cable to the router? Can it still access the internet?