Comment by mmahemoff

You’re correct. One suggestion is explicitly request email or text instead of calling. (Or WhatsApp in many countries.) Since some people are hearing-impaired, it’s not even an unusual request even before this spam program arose.

It won’t always work, e.g. the request won’t reach the delivery driver who’s a contractor of the subcontractor of the logistics company you mention this to. However, I’ve found it works with businesses that are small enough to care about customer satisfaction.