5 continuous calls in the last 1/2 hour. Does not leave a message. I do answer if I do not know the number. Will turn on answering machine and let it ring and ring and ring. I do have an air horn. The possibilities are endless.
After seeing the messages on this post and having received a number of back to back calls as nauseum, I just blocked that phone # from my i-phone by making up a fictitious name ("A100") in Contacts, inserted the offending phone, then once the contact was created, I selected "block all calls from this contact"...and they'll never get through again...if they do via another number, then I'll block that one too and so on. I use this methodology for all of these type of cold call solicitor fools!