Answer AS a business, and they usually take you off the list - assuming you get to a person to do so.
Unless their intent is to call a business. I get the same 5-10 indian call centers calling me 5-10 times a day calling my office to try and sell something or other.
Used to be programming the phone switch to block "Unknown Caller" would eliminate 90% of the bullshit calls. With phone number spoofing so prevalent I'm down to white listing people who can call me. Even then, that's not 100% because the scum sucking slimy bastards impersonate your own number now too.
I just wish we'd nuke India and their stupid call centers and get it over with.