I have tried several times and it has worked!call 1-800-375-5283
select English option
Then press option 2 to inquire about pending case
then enter option 6
option 1 is pressed after if to enter receipt number
after message of case status press 3 to continue
then press option 4 which says it is in case you filed related family cases and you believe they were separated, don't worry. after a few moments you will be transferred to Texas Sevice center automatically and directly .They will again ask you for Receipt # or alien number. If you give Alien# make sure they look at the right case since it will pop-up in their screen all cases related to your A#/.You better do this between 1 and 3 pm. I have tried at other hours of the day and it has failed. Good luck!