Bamatech delay giving me sleepless nights!

Anyone else facing crazy delays with Bamatech Realtors & Developers in Sector 132? Booked a 3BHK almost 4 years back. Possession was promised ages ago. My kids' school admission depends on us moving. Keep getting vague answers. Spoke to other buyers, they're equally frustrated. Should I just sell and cut my losses? Is it even possible to sell an under-construction property easily? Honestly not sure what to do. Any advice?