Builder ki manmani in Top Builders area, frustrated

Since January I've been shortlisting flats in this city, and honestly, I'm fed up with how some builders in the 'Top Builders' corridor operate. One project promised possession in 2.5 years, ab tak kuch nahi. Now they're asking for extra PLC charges too, jo pehle discuss nahi kiye the. Is this common? Should I just accept these 'hidden' clauses, ya koi way out hai?