Delhi Development Authority [DDA] — dda flat surrender money not received yet.

Address: New Delhi, Delhi

I have applied for surrender of my dda flat in dec but i haven't received any money yet in my account. I didn't received any letter also regarding surrender money. I am attaching my application form form for all details. Does anybody have information, when i will receive money.
I have a acknowledgement slip from department, when i surrender my flat.