After your manager has the company issued acceptance of resignation?
Has the company issued any condition for acceptance of resignation in writing or demanded in writing that you sign a non compete, non solicitation agreement etc……?
In the link to another thread provided to you the employee has sent enough communications to company and has built favorable written record.
And now he shall be protected to an extent.
You may not be able to handle the HR, Line managers, employer on your own.
Pls consult elders in the family, competent and experienced well wishers, lawyer/law firm and proceed under expert advice, submit carefully structured communications under proper acknowledgment by redg. post and build favorable record.