Today I received 6 calls from this number.  They were advising me they were going to file a collections suit against me if I didn't pay immediately for a service I never used.  When I asked for additional information, they were unable to provide anything, but they did provide this number as a callback number.  When I called it they gave me the same 'pitch', had no management available, and ended up calling me a '[***]' before hanging up on me.