BPTP — Poor Maintenance service

I have a house in BPTP Parkland M7-04. There has been low voltage electricity and frequent power cuts from past several months. I have been complaining and writing email to the concerns maintenance but they are neither fixing the issue nor they are replying my email. Even one of their employee called me and started misbehaving. I have written to the maintenance department so many times but they are not replying. I have attached screenshot of written emails. Please take action against this mental harrasment. I have been paying approx rs 5000/- as maintenance every quarter and they are not providing any service.