Who called from 7184835934

This number calls my cell phone...but never leaves message...If anyone finds out who this is...please post caller info...thanks

I've only received one call from this number. I live in Washington state.
When I call the number I get a fax tone.

it is a bill collector

This is a bill collector, don't know what company.

I owe Sallie Mae some payments, and this guy calls me threatening me, he is a bill collector.