1. Proceeding under Insolvency Code is not meant for recovery. You can raise the demand and if demand is not fulfilled and your demanded amount is more than one lakh then you can initiate procedding under insolvency code.
2. Check from authority and if rule permits you can get the completition certificate in respect of your particular building.
3. Till mutation is not complete the property shall reflect in record as builder property. Yes, it will impact your title over the flat so you have to go strategically.
4. Pl refer point 1 of reply.