Delay in handing over of flat possession

I purchase of a flat Yamuna Expressway. As per the said agreement it should be handed over till (15th August 2015 extended 6 months). But still not handed over yet. Since i have already paid 95% of the agreed flat purchased amount. Still they are saying that will take 6 months more to complete the flat and handover till June'2022. However I been went to the side location recently last two months back and the side location conditions is not good , as per the discussed with Labour and Contractor and they stated that builder is not paying their amount hence building construction work has stop last 1yr. This has caused severe mental anxiety to me and family. I am unnecessarily paying rent from stay at another flat and also paying interest on the home loan taken from the bank, which is causing additional financial stress for me. Please give me a valid suggestion, that what should i do on this issue.