What legal action can be taken against builder fraud?

This dispute has been ongoing for approximately 20 years. In June 2006, a registered agreement was executed for a single combined residential unit created by amalgamating two 1-BHK flats. Although the builder amended the agreement to reflect the combined unit, the builder failed to amend the corresponding municipal records and approved drawings. Relying on the municipal records, the housing society continued to treat the property as two separate flats, resulting in higher maintenance charges being levied for several years. Key Issues: 1. The builder's failure to rectify and update the municipal records in accordance with the registered agreement. 2. The housing society's refusal to recognize the registered agreement and its continued reliance on outdated municipal records. 3. Excess maintenance charges collected for approximately 16 years. 4. Recovery of advocate's fees by the society despite a consumer forum order directing each party to bear its own costs. 5. Levy of 21% interest on disputed legal charges. 6. Return of the consumer complaint for presentation before the appropriate forum without any adjudication on the merits of the case. What legal remedies are available in these circumstances against the builder and the housing society?