Vodafone India — vulgar messages and calls from different numbers

Hi
The number [protected] is constantly calling and disturbing me with vulgar messages and calls.. When asked who is he or whom does he wants to talk doesn't respond to that however if i block 1 number he does the same from a different number. Tried calling back to know but calls can't be reached and it's really really making my life hell as my phone constantly rings or vibrates throughout the day. I want serious action to be taken in regards to this as when asked my service provider they completely refused to take any action against it.