Extension in joining for Post of Female Counsellor (Contract basis) in Navodaya Vidalaya

Hi Sir/Madam, On 09/09/19 , i appeared for Interview for the Post of Female Counsellor (Contract basis) in Navodaya Vidalaya,this vacancy is for across the India Navodaya Schools.My interview is done at Navodaya Vidala office,Noida.Last week i received job offer letter but against my good interview score & feedback of family conditions i shared with interview pannel, place of posting i got in offer letter is Assam. My job location preference based on family circumstances were discussed with interview pannel at time of interview & i request it would be accommodating for me if i could get job posting in Uttar Pradesh or any neighboring state compared to distant location of north east. My family live in Ghaziabad , i have my old age parents & daughter who needs my observation. I donot have hard choice on city but if place of posting is in Uttar Pradesh i would somehow adjust between work & family front. I have visited Navodaya Regional office here & explained my circumstances , as they instructed me i put an application there requesting job transfer. My queries are below :- 1. Is there legal someway through which i can initiate request for job transfer in light of my current circumstances ? 2.Last date of joining in offer letter is 13/10/19, what are ways to get extension in joining ? Thanks.