Vodafone India — outgoing call issue

Dear sir, i have a vodafone postpaid connection, since past 4 days whenever i am trying to make a call, 9 out of 10 times i am getting a beep sound instead of normal ring. The other person receives the call but i am unable to hear anything. No issues though with incoming calls & internet services. All other sim cards are working properly in the handset. I have already lodged the complaint at vodafone customer care but no action yet. This is very irritating situation as it is my official number & my work is getting affected because of this.