Electricity connection taken by other person on my property while i am in possession of property

Respected Members, This query is in relation of a electricity connection which is taken fraudulently by a person on my property before i actually took the possession of the property, now the electricity board BSES (Delhi) is not issuing connection on my application. Following are the highlight to understand this case better- 1. I registered this property in Jan 2017 and actually took possession in June 2017 and since then living in this place, i have gas connection, water connection and registered as voter and changed Adhaar too on this address to show as permanent resident. 2. This fraud person have given some loan to builder and builder gave him builder agreement and made a fake GPA of property in exchange behind our back. Now builder have fled and many civil cases are lodged against him by many members of other flats in area. 3. This fraud persons intention is to make case against us on property rights which he hasn't made yet and didn't came across to us for it. 4. We have filed complaint to police station against him for the same but police is not supporting and telling us to move this matter to court. 5. We also approved BSES (Delhi) to investigate but they simply denied and told us to move court as well. I want to know what steps i should take to resolve this situation please advice. KAMAL PAL Please contact as soon as possible.