Possession delayed for 5 years & co. deny to pay any penalty

I had booked a flat with nitishree shourya greens (p) ltd in jalandhar in dec 2006. Co. issue me a allotment letter in jan 2007 and commited to give possession in dec 2008. However co. never provide me any document stating such commitment. But the co. havnt yet give me possession till date. When I asked for penalty for late possession they deny their liabilty from such liability. They said that I havnt yet enter into any agreement with the co. In the allotment letter it was written that I was requiref to enter into angreement with co when I was called to do so. Co. never called me till date to enter into such agreement . However in 2009 they told me oraly that they will pay me a penalty for late possession @ Rs. 5 per sqft from jan2009 to date of possession. Now co. deny from such liability. I paid all the installment that they demanded from me till today. There is still no sign of giving possession in coming days. I dont know what to do now... Anybody plz help me... Its urgent.... Thanx