collection agency keeps calling harassing calls in the morning and at night.,

Please do not call me any more

I receive these calls on my home phone and my cell phone from RMS.  They are a collection agency hired by RCN Telecommunications.  After repeatedly disputing the charges from RCN, via BBB, Certified letter and copies sent to this company thay still call.  I actually asked one of their operarators, after I explained this is a disputed amount, where she got her law degree.  They are nasty and beligerent.

Called and no message left.  I called back and stated they did not have my number in database
RMS collection agency No account with RCN ever