RECENTLY ONE OF MY RELATIVE APPLIED FOR EXTENSION OF STAY IN B1/B2(VISITOR VISA.....NOW SHE HAS RECEIVED LETTER 797C FROM USCIS STTING APPLLICATION HAS BEEN RECIEVED N DECISION IS PENDING............... NOW HER STAY IS EXPIRING ON 27TH SEPTEMBER CAN SHE STAY LONGER THAN THAT AFTER RECEIVING THIS LETTER FROM USCIS UNTIL SHE GET FINAL DECISION ON HER APPLICATION? HOW HELPFUL IS IT TO CALL USCIS CUSTOMER SERVICE?DO THEY ENTERTAIN ASKING ME THIS Q? PLEASE SUGGEST