Delhi Development Authority [DDA] — full refund not received till now

Hello Sir,
I have booked Flat in DDA AAWASIYA YOJANA 2017.in drow i got Sirajpue LIG flat.
i have submitted withdraw form on 14 march 18 and yesturday i received 50000 Rs only.
as per my form i should get 100000 Rs. please check and refund remaning money ASAP.
Below all details.
Schema DDAY17
APP NO.2001361
FILE NO L/[protected]/DDAY17/SA
DEMAND LETTER MO 1194

Thanks,
Priya K