Got a letter in the mail from merchant services.

CB Merchant Services
(debt collector)

If you're going to call my home, you better damn well respond when someone answers! DO NOT CALL ME AGAIN!!!

I've been getting calls.
For now,been using "Mr. Number" to block calls.
Using this app for my phone for about 5 months.
If they use a different number, you can sure block them.
Mr. Number shows this number is tagged as "spam" 33 times.

How do you get Mr number?  Dies it work with cell phones?