Dear Samsung, After waiting so long you got a good chance from visa office which is a green signal for you PR application process. There is no exemption or chance for extending the their date. You have to follow what the visa office requested. Therefore, it is my suggestion that you should take the matter seriously and submit all the updated documents together with the latest bank statement. Anyhow you should arrange the money to show the required balance in your account. Otherwise there could be a negative action on your file.
well said...
Samsong: Don't have a false hope of ways in delaying your submission, I don't think it's attainable. You should be thankful that CIC responded which should mean a very positive development on your application (it's moving!

). You are the only one who can find ways to solve your bank statement problem. I'm praying that you could make it through.
Happy New Year!