I did File and Suspend before Apr 2016 (turned 66 in Sep 2015). My plan was to not take SS until I turned 70 (I have a military pension). Unfortunately for me, I now have cancer with a very low 10 year survival rate. I called our local SS office and asked how much my lump sum payment would be and was told that this payment option stopped. I thought that when I signed up for F & S before Apr 16 that this would still be there.
I'm sorry to hear about your prognosis.