Started the process of buying a flat in DS Max in...

Started the process of buying a flat in DS Max in Dec 17 now it's going to be 4 months, couldn't get the things done till date. Staffs are so irresponsible and lazy that no one even bother to inform us about the status and issues. Sometimes i feel, are they even aware of that we are buying their flat Allready paid 20% so cannot do anything