bsoni,
I have a very bad experience in making a phone call to Mumbai consulate. I tried for thrice and twice of them just kept on ringing for 10 minutes or so and then got disconnected. The third time, the lady on the other side transferred my call to somebody who never picked up the phone. I was calling them around 10-10:30 CST (it was prior to day-light saving). Also, I have heard after 2:00PM (indian standard time), is a good time to call them.
As far as mail is concerned, I have sent 4 mails in the last 3 weeks.
cheers!!
Ranen
PS: Oh, as regards of my anticipation of 4th/5th Jan for ur interview date - January is the slowest month for VISA issuance etc...