Property Issue

The flat was ready in 2018 in Pune but builder refused to repair the leakage in bedroom. Even after several emails there was no confirmation of repair & no proof was ever sent. Also in aapna aap i get calls asking for permission to enter in my flat which I haven't got possession. The property tax is not paid by builder & the electric charges are also not paid by builder. Now builder is asking for balance payment with delay charges. The builder is not ready to clear electric bills & property tax. Since the repair work was refused I had stopped the payment & till date there is no answer from builder for repair work. Builder refused to pay property tax & electric bills stating it's not their responsibility. Builder is stating first you take possession & then we will see. now after several emails the repair work is not done so can't I get the entire paid amount back with interest. Who pays property tax if possession is with builder?