Consumer Redressal

I had booked a flat to Saino(I) Project Private limited in 2013 by paying an advance money of 8 lakhs out of total consideration money 51 lakhs.Last of all I cancelled the flat on 29th dec 2013 as my mother suffereing from a severe disease cancer.They are supposed to return back the full money within 1 month after the date of cancellation but after several follw up they paid by partail payment 7 lakhs but now for the balance 1 lakh they are not confirming anything.Even they are not picking up our phone inspite of several sms to them that we need the money as my mother is suffereing from cancer. I beg your kind help in this matter otherwise I won't be abale to save my mother.