Had a missed call from this number. After a couple of hours they called again. Picked up but there was just silence.

They wait until your voicemail picks up, give a couple seconds of silence, then hang up.  Just so you have to go through the trouble of deleting the voicemail message

I picked up the phone and the caller waited two seconds then hung up

Spoke to a live yet distant person.  Abbey from member ads was how she identified herself.  Took several times of repeating for her responses.  When asked for a number to call back to, caller hung up.

left a voice message with radom voices talking. when i called the number back it was busy then it just rang and rang!  before they have called and when i answer, no one is there!