Once you listen to the status of your case (via the 800 number) there will be a prompt to press 3 for more options. From the next menu that you hear, there is an option to press if you believe your case has been separated. (There are a few other options as well. I've used the separated option so I know it works). Pressing this will connect you to a TSC officer. A couple of things to remember:
1. Don't press an option unless your case falls into one of the options available. That is, don't press the option for a separated case, and then ask the officer something totally unrelated once he gets on the phone. It's not going to make for a pleasant phone call.
2. Remember the time zone of TSC. While the 800 number officers become available at 8am EST, the Texas people won't be available until about 9am EST. (due to the time difference). Pressing an option above will bounce you to a customer service rep if the TSC is not yet open. (and the customer rep is useless).
Regards
Rav