I need this. I've had bloody Freshworks calling me every single day for the past month, even though I ask them to remove me from their list every time. It doesn't matter if I ask nicely, whether I listen to their pitch or don't, whether I make threats, they still call.
I will never, ever, work with Freshworks, Freshdesk, Freshservice, or any of their other products as a direct result of this.
Look up what the name of the list is in your country, cite it the next time they call, and that you'll report them to <name of local agency> unless they cease, I'm sure they'll get the message :)
Most of the people doing cold-calling been trained to listen for the names of the lists, and have strict orders what to do with the number in case someone they call brings it up.
As crude as it sounds; try pulling a madman show. Cussing, screaming, threatening to go after them, completely loosing it. I suspect they have a field for notes in the agent database and will mark you as difficult or improbable lead, and stop calling.
I will never, ever, work with Freshworks, Freshdesk, Freshservice, or any of their other products as a direct result of this.