Regarding lien period

Respected sir/Madam, I have passed an exam of Assistant Malaria Inspector in East Delhi Municipal Corporation. I have applied for technical resignation from my previous department. My department issued me technical resignation and relieving order. When I went for joining in EDMC for new job. EDMC told me that we have considered you as a fresh candidate. If I join as fresh candidate according to advt of DSSSB I was over age. Now I want to ask you that can I roll back to my previous department. the date of relieving order 23-10-2017 and I file my representation regarding cancellation of technical resignation order on dated 27-10-2017. Sir I need urgent help