Vodafone India — constant calls harassing me for offers even after porting out

I am ex consumer of vodafone. I ported out of their subpar service after 8 yrs. I keep getting calls from them every day despite telling them i am no more with vodafone. This pisses me off.

1. I registered complaint twice.
2. I pinged them on social media platforms, they said they will call never called!
3. I have told every one of their calling agent to remove me from database, are they illterate?
4. I am hr and i dont have liberty to ignore unknown calls. Vodafone has harrased me over 6 months now and most in last 3 months.
I buy service for communication not for telemarketing!
Stop this mental anguish & harrasement!