What's the worst possible place I can give my phone number to?

I was recently trying to find my mother some health insurance. In the process, I submitted my phone number online to two companies. Now my phone is blowing up with phone calls. What are the worst places I can submit my phone number to so I can avoid these mistakes in the future?
Okay, well, this is actually because I'm trying to make my mom's ex bf's phone blow up with all of those anoying 3am calls. I know it sounds like stupid revenge for him blackmailing my mom, but I got this idea from him and the many ways he tortures his ex wife (that shoulda been a warning sign -.-)

so his two numbers are *drumroll*

405.761.5184
918.264.2473

The bathroom wall in the local perv bar

For a good time call
Xxx-xxx-xxxx