Delhi Development Authority [DDA] — no refund of my security amount

Address: New Delhi, Delhi, 110059

Dear sir
I was allotted a flat in dda housing scheme 2017. My application was 1713082. Due to some personal problem, i was not able to purchase the flat so i surrendered my flat on 19 january 2018 reference number rec/11/18/1.767.
I was told that i will get my refundable money of 1lac in 15 days. But later on when i did not receive my refund i contacted the dda authority in vikas sadan, they told me that i will get back my refund by 31st of march 2018. I have repeatedly visited dda vikas sadan but they are not giving me any relevant date.
Sir it is my hard earned money it is already more than months which otherwise would have fetched me some interest as their policy if i would not have paid the money for my flat i was supposed to pay an interest of 10.
Kindly help me sir i want my money as i am in need of it.
Hoping to get my request disposed.
Thanking you
Yours truly
Pranav pandey
Mob [protected]
Email [protected]@gmail.com