This guy had the right idea: 'How one man turns annoying cold calls into cash' (http://www.bbc.com/news/technology-23869462 http://www.bbc.com/news/technology-2

This guy had the right idea: 'How one man turns annoying cold calls into cash' (http://www.bbc.com/news/technology-23869462 http://www.bbc.com/news/technology-23869462) and 'Cold-call victim gets his own back' (https://www.theguardian.com/money/2013/aug/29/cold-call-victim-gets-own-back https://www.theguardian.com/money/2013/aug/29/cold-call-vict...). It depends on your situation, but it may be possible to turn lemons into sparkly lemonade!