Ask you CA to provide user id and password. It is you property, your CA cannot use it without your permission.
First it is your mistake that you did not take your user id and password. Penalty is not 5,000 but 100 Rs. per day. So if you file on Monday then you have to pay 100 as penalty.
As of now notification has not come regarding extension of due date. Wait may be government will announce the extension.