Ijaz

Hi All, I applied for 457 visa on 30-Aug 2017 but my employer sponsorship got expired on 11 oct 2017 for which i and my employer received a justice letter from immi dept, any one having idea how to proceed in this case? is it wise for employer to apply for sponsorship renewal and it the same time apply for new nomination even the sponsorship is not approved? how shall i respond to immi dept they asked me to comment within 28 days, i received letter on 11 nov 2017. Thank you, Best Regards, Ijaz Ahmad