Flat Sold Twice By The Builder

By flat in DLF Dilshad Garden Ext was sold to two personnel. I am living here for past 4 years and suddenly got a notice to vacate the same. I am holding registry of the said flat with electricity and gas pipeline in my name. Even loan is running on the same by LIC, and registry is mortgaged. Upon enquiring, i got to know the builder has taken some amount from a person to construct the flat and in-lieu offered this flat to the lender. The lender has taken this matter to court against the builder. The court cancelled my registry and without serving any notice as builder did not have any presentation in the court. On presentation to the court, the judge was surprised to hear that family is already living from past 4 years and have valid registry and even LIC has sanctioned loan. Now the builder is pressuring me for not going to court or to LIC, meantime local police is investigating the matter but are good friends of builder. Please suggest where should i knock the door ? Should i stop paying loan of LIC ? Me and my family are stressed as builder is giving threats for not going to court against him. Can i ask CM Yoginath Ji to take this on priority and ask hon judge to provide me protection. Please suggest.