Tamil Nadu Electricity Board [TNEB] — Rejected my application to change the single to 3 phase service

We are staying more than 10 years in Janaki nagar, Maduravoyal, Chennai-95. They gave single phase 10 years back but when I request them to change it as 3 phase, they asked recent property tax bill and rejected my application. The government gave an option to receive electricity with sale deed or some other option but they are asking property tax bill and rejecting it. We have EB bill, address proof, metro and drainage bill but still they are not accepting my request. Please kindly do the needful.