I'm forwarding this comment that worked for me too; I got these calls for a week then saw a helpful comment for a do not call service at 866-246-7196. I spoke to someone there and they said they provide this service for a small number of companies that call consumers that want to minimize complaints and save time not calling people who dont want to be called. I gave them the callers phone number and they verified to be on their list then they added my receiving phone number to they do not call list.
United States