LATE FEES IN GST

HI ALL,

GSTR 1 AND 3B FILING  FOR DEC 2020  for a client was filed on 30TH JAN 2021, DUE TO DELAY IN REVOCATION OF CANCELLATION APPROVAL and  a grivance WAS FILED FOR CLAIMING ITC issue and it took some time to receive the resolution after which, the gstr was filed on 30 th jan.

Now,  the late fees for that time gap (23nd jan-30th jan) is now claimed during filing the jan gstr3b.

now,  if the above reasons are raised as a grievance , is there any possibility to waive off the late fees for the client.

pls clarify.tnx