When will be builder give concrete answers.

Thank you all for the response. I am sure there are many more who are seeking answers.
The updates
1) I called Mr. Bipul at HO. He told me that work will start by month-end. The reason for the delay is transfer of Chief Engineer at MMRDA. They had to resubmit for approvals to the new engineer. I cross-checked with my source at MMRDA and he too gave the same reason. So let us wait for month-end.
2) The Chief Engineer will take time to go through the papers & will take 2 months to approve/pass orders. The builder is keen to start work. But some or the other issue is delaying. Some reasons for delay might be genuine, but not all.
3) The builder is ready to refund the monies (this is what Bipul said), but then no interest will be paid. If they refund our 10 lacs, we have lost about 5 lacs as interest in two years; much more as opportunity.
4) We can all meet on first Sunday of March at site. This should help to know exact status of the project.