Vodafone India — Spam calls

Address:	Thane, Maharashtra, 400603
Website:	vodafone.com

I'm getting continuous spam calls from both local and international numbers.
Even after blocking more than 100+ numbers on truecaller, they continue to ring in.
On answering local numbers no one talks or responds - it is just a blank call.
On requesting Vodafone to look into this matter at their store in Naupada, Thane West they simply refused to entertain and said I'll need to log a FIR for this and Vodafone cannot help stop spam calls.
I fail to understand why cannot vodafone as a service provider take a note of spam calls? Isn't it their job to ensure their customers receive zero spam calls.
Disgusting approach!