I visited the CGI-SF in connection to my granted (and then, stuck) OCI application despite sending surrender certificate etc. I went to CGI-SF at around 9:30, there were about 6-8 people for OCI, in addition to other services. The OCI customers wait outside, all others are allowed inside. We queued up and waited outside, and at around 10am, the person processing OCI came to the outside ("passport pickup") counter and spoke to us individually. So if you have any urgent need and can go to SF, you could perhaps go there around 9:30am, and after some wait, you can speak to the person who processes the application.
Unlike other government organizations I've dealt with (US and Indian), the consulate was a welcome change - they are actually trying to help us instead of "just doing a job".
Also - I was also successful reaching the OCI cell over phone. I tried probably 50 times, and got lucky (around 3pm).