Sahara India Pariwar — possession not given on committed time

We had purchased flat in sahara city in jaipur in year 2008, we have been told that possession will be given in year 2013, there is no office where we can go and speak, we had a visit there in year of 2009 till time registered office there,
We have paid full amount to the group, there is no information and no one avaiable in th office.
Its been more than 6 years.
Conatact Number:-[protected].

We want sahara to refund our money with interest.