gstr1

Gst  payable on Services supplied by a recovery  agent  to banking company  is under  RCM  as per the notification 13/2017 dt 28/6/2017 . So as recipient of service Bank will pay GST  under RCM  and if you register under GST you have file nil  return both GSTR 1  and GSTR3B  

Please confirm with others also. 

I  think you have show RCM in GSTR 1 , please confirm