Who called from 8477590798

This is the Van Ru collection company. They leaves messages stating they are trying to collect a debt and name a person I don't even know.

they call and when you answer the line is ringing and then it disconnects

I keep receiving calls from this number with a machine that wants me call about some bill.  I have no idea what they're talking about.

person keeps calling from this number and either hangs up or tells me they are a collection agency for a company whom I have already made payments to..very persistent and rude

I get these calls on my cell phone only and they never even stay on the line long enough to talk... I pick up and they hang right up... I'm getting really sick of this...