BSNL Mobile — no missed call alert with fault

MY MOBILE NO IS [protected]. I HAVE ACTIVATED MISSED CALL ALERT BEFORE SOME DAYS, AND NOT GETTING THE SAME, MOREOVER WHEN MY MOBILE IS SWITCH OFF, AND MY NUMBER IS CALLED IT SAYS THAT THE ' NUMBER DOES NOT EXIST'. I HAVE COMPLAINED AND REPORTED TO THE CUSTOMER CARE FOR MORE THAN 16 TIMES WITH NO RESULT. IT IS REALLY FRUSTRATING TO CONTINUE THE USE OF BSNL MOBILE. I WILL BE COMPELLED TO APPEAL THE CONSUMER COURT IF MY PROBLEM IS NOT SOLVED IN 2 DAYS.