Refund process before agreement under rera project

I have applied for flat under rera project in Aug 2017 the amont was paid by me thru chq.which got cleare in 1st week of september Due to some unavoidable circumstances in my family I applied for refund in 1st week of february .They told me at first that I will get refund by 17 march 2018 When contacted on 22 march personally they told me that refund will be possible only after 31 march.I again contacted them telephonically on 6 april .They assured me that amount will be refunded by cheque by 15 april.Tge date again got extended to the last week of april 2018 .On 21 april when i contacted them they assured me that I will surely get call from CRM Deptt.by the end of next week i.e. 28April i didnt received any call and again contacted them on 27 april .they told me that signature of senior is pending and i should have patience and wait for another two days .I am calling them daily from 30 april till date but didnt get any satisfactory reply.I exactly want to know the time taken for refund and if the sufficient time has elapsed what should i do ao as to get the rwfund with interest