What are the legal actions I can take against breach of contract ?

I booked an apartment with Casagrand in Jan 2021, expecting possession by May 2023. Despite a one-year extension due to Covid and floods, there's still no completion certificate as of Mar 2024, causing significant delays. Registration was denied until 95% payment completion, resulting in financial loss of close to 2 Lakhs. Considering legal action for breaches of contract and consumer rights, seeking guidance for resolution and compensation..