Today (16-01-2018) morning around 7.15 AM the problem in filing GSTR-1 was solved. Till that time, the problem persisted. Now, I have filed GSTR-1 for Oct-Dec quarter under EVC. Thank god.
P.S. I am not aware whether problem in GSTR-3B filing is solved. If it is solved, kindly infiorm in this forum so that I can pay, offset and file GSTR-3B for Dec.