Policy Bazaar — way too many silent calls

I had visited and registered on policybazaar website to inquire about general insurance policies.
I communicated with their agents a few times about policy requirements and quotes.
Eventually, I found a local agent and bought policy locally, instead of policybazaar.
Now, I get multiple calls from policybazaar numbers starting with +91124509* every day.
No one speaks anything after I answer the call.
It seems like they're trying to harass because I didn't buy policy from them.
I get at least 5-10 calls every day at different times from the same series of numbers.