jenny YES please do write to them. And again at the bottom say hopping to hear from you soon. Then give them a certain period which you think is convenient for them to recap, then follow up to the letter the letter you wrote to them by attaching a fresh letter again and inform them you have attached a previous letter. I know the nrb cic they are working and they have a back log but just as to be professionals i always dont leave any fax, email, or letter i receive undone. Its my duty to give a response otherwise i will land myself in problems at work. The same with cic.
Good luck all you people. I know many people applied long long ago even before me, but cic might have thought they never were not in hurry. For my case, when they requested additional documents. I sent the ones i could aford to send, and kept on updating them, so i think it makes worker understand your case better when in doubt.