Consumer Redressal

I had bght a flat in resale, in Gardenia Aims Glory, sector-46, Noida by raising a huge loan from Bank. This prject was strted in the year 2008 and was supposed to give posesion in 2012. 95% had already been paid and rest 5% was to be paid while posesion. Before buying the flat,they confirmed, will be giving the possession in June 2014, at the best. Now in June 2015, the Builder has sent me demand of the rest 5% asking me to pay within 1 month, otherwise intt will be charged @18%. They have mentioned that now they will only provide me the keys in next 2-3 months and still registry is not possible, because of some NGT issues. They further said that registry of about 200 projects is withheld due to this issue n they are not sure how long this issue will persist (may be 2-3 years or may be more). I cannot even let out my flat in the absence of the flat registered in my name. After handing over the keys, they wl be chrging huge maintnance fee. How huge intt n mntnce cost will be born by me