Complaint Review: West Asset Management

This so called "fair debt collection " company started their harassing phone calls right after I had my phone number changed,because of receiving the same types of calls. I keep up very well with my debts. In many cases I have automatic debits from my checking account. I know that these calls are an attempt to rip me off in some way. They will not leave a message. If this was legitimate, then why are they not sending correspondence through the mail? I would like to sue these idiots!