head of the department has been given authority to take a decision when an application is received from an official seeking exemption from poll duty.

2) rely upon ECI letter wherein it  is mentioned that re employed service men are exempt from election duty 

3) if your application is rejected make representation to EC 

Re employed or tenure extended of an employee in same dept. In your case you are from army retire and freshly employed in bank. Not actually reemployed. 

You can approach the election Commission and HOD of the said department where you are working

If you are not reemployed after retirement then go for the election duty, read the circular you have cited carefully.

Hello, 

You must file a writ in the HC and state that the duty is being given to you despite the fact that ECI has passed a letter. They can not act and pass order against the GO and statutes. 

Regards 

See you can file an representation before the election officer if he fails to exempt you as per circular file representation before the EC and /or authority above election officer.

Approach before ECI or make representation letter to ECI. 

This indicates that your representation has not reached the competent authority which decides about deploying personnel for election duties.

Have you been forced by yor employer to accept this duty?, if not then it was a voluntary act from your side, then why do you do not want to do this duty?

If it was forced on you then you can meet the collectorate and give a representation in writing along with the copy of the letter which exempts you from doing such duties and claim exemption on this, if it is still rejected then you may file a writ petition before high court on the same lines and get your assignment cancelled