Thanks Jagee..
NVC Phone no: 603 334-0700, select options 2,2,3 and then enter your INS or wrong NVC no and talk to an operator. When you get the msg as NVC case no not found push the button "0", you will be connected to an operator.
According to the last VSC processing times, I-824 should be current and when I talked to the VSC operator two weeks back, she told they are doing 824 cases with Aug20 date.