Vgn Property Developers — refund amount

Address:

Chennai, Tamil Nadu, 600095

I booked a flat vgn-royale and paid in advance rs20000 after one month i cancelled the booking due to my personal problem and the same was explained with manager so they committed to return the full amount without any penalty after listening to my story and more than 5 month iam following with vgn but not responded, and today i received mail from vgn full amount was deducted for cancellation charges, i have not signed any agreement with the builder. I would like to know, if there is any way to get the amount???