If you are not able to fix the Optus login problem, then you need to ask customer care for help. For Optus internet and webmail you can reach out to the customer care team. Just dial http://optus.technicalhelpaustralia.com/optus-technical-support-number/ »
1-800-789-560. With the help of trained experts of customer care experts and tell them to resolve the Optus login error which you are getting. The service of the customer care team is always available for its users. That means if you want you can get in touch with customer support at 24 X 7.