I get calls from this number and ignore them.
Have entered the name "DO NOT ANSWER!" in my cellphone, which takes calls switched from my home phone.
Another tactic when I am called from a solicitor.

I play the role of stalker and ask, "What are you wearing?"
If they describe innocuous outer clothing, "No. I meant what are you wearing under that?"
One woman told me I couldn't talk to her like that but I reminded her that she had called ME.

Just act real friendly and swarmy and see if you can get under their skin.