If your persistence didn’t convince the router, you can try expressing your disappointment with its performance by threatening that you are about to relinquish its services. This sometimes works wonders. One reason for having trouble connecting could be that you have connected to the router in the past but the owner has since changed the password (network security key). For some reason, Windows doesn’t inform you if reconnecting with a previously valid password fails. I think this is a bug. If you right-click the router and then navigate to Forget this network, the connection is reset. Windows will prompt for the new password when you reconnect.