Supertech's brochure promises and reality are miles apart.

I'm seriously regretting my decision to invest in a Supertech project in Noida. The brochure showed all these fancy amenities, but 3 years after possession, half of them are still 'under construction'. Matlab, what was I paying for? And don't even get me started on the hidden charges at the time of possession. PLC, EDC, IDC – it all added up to a huge amount. I felt completely cheated. From my experience, their customer support is useless; they never pick up the phone. I am so frustrated right now. Has anyone else faced similar issues with Supertech? What did you do? Is legal action the only way to get anything done? Honestly not sure if I should sell at a loss or stick it out. Any advice?