MBD - Useless useless useless.....

I assume I am now getting calls from MBD Attorneys for someone else's debt. I say assume because i cannot understand the person on the other end of the phone. And the calls are always from what looks like a private number. Surely if it's a business they have a land line or something more professional. How do I contact MBD Attorneys? Is there an email address for them? They really are very useless.