Delhi Development Authority [DDA] — refund not received of my surrender dda flat

I have applied DDA AAWASIYA YOJNA 2017 on 01 Aug 2017 by Online HDFC BANK with registration fee INR 100200. Selection was based on lucky draw and result had been draw on 30 November 2017 and I have selected in lucky draw but my selected flat room is very small.

So I have surrendered my flat DDA AAWASIYA YOJNA 2017 at DDA Vikas Sadan on 14 December 2017 and got the receipt and He told me that your amount will be refunded in around 1.5 months. But still I have not received my refund amount and there is no information regarding this.

I have attached my surrender receipt.

My DDA File Number: APP.NO-1502853.

Please do the needful

Thank you