Hii Manek,
Please rest assured that web based CSQ is a reliable method and you need not be nervous about it. The VO also has started to prefer it over any other mode of correspondence ( as is clear from the communication you recd about it)
Now, about me...I had to update VO about birth of child and ask VO about the procedure to add the new born to the application, hence I used the CSQ through the link provided by wilson above and got an acknowledgement of receipt of my communication from the VO (on my email id given while applying) in 3 business days time...although VO has not responded since then about the procedure to follow ! (it has been 1 month and 15 days)
But rest assured, the web based CSQ path is a reliable mode

Hope that helps and eases some tension from your mind..
Regards,
JUNER 2011