Delay in Construction and Registration

Booking and Agreement: I booked an apartment in Casagrand, Chennai, on 30 Jan 2021, and signed the agreement on 12 Feb 2023. The agreement stated a delivery date of May 2023 with a 3-month grace period. Extension Approval and Delays: Casagrand obtained a 1-year extension approval from TNRera in December 2022, citing reasons like Covid and floods. However, despite this extension, there's still no completion certificate as of March 2024, causing significant delays in possession. Registration Issues: I requested registration of the apartment in February 2022 due to rumors of an impending increase in registration charges in Tamil Nadu. However, Casagrand denied registration, stating it could only be done after 95% of the payment completion, which has caused me financial inconvenience. Financial Loss: Due to the delays in construction, registration issues, and subsequent revision in registration charges, I have incurred a financial loss of close to 3.5 Lakhs. Considering the breaches of contract and consumer rights, I am contemplating filing a case in the Tamil Nadu consumer court. I seek guidance on the eligibility of my case and the appropriate steps to seek resolution and potential compensation.