Forgot to submit the postals within due date

I forgot to submit the postals for Group III withing the due date for December 2011 exams (submitted it around 15 days late). However, I have submitted the postals for Group IV within the due date. I enquired at the ICWAI office, whether I can appear for both groups, and they said I can only appear for Group IV. 

Even then, I'm planning to appear for both groups, and intend to fill the exam form by giving my Group III postal details as "Not Yet Received". I want to give both the groups in one sitting because I want to get a good rank.

So what do you think will happen, if I do this. Will I be allowed to sit for both groups?

Had this been ICSI, I'm damn sure I could have got away even without submitting the postals, because they are very lenient regarding postals. But what in case of ICWAI?

Thanks.