Who called from 31205813900

They've called me on my celphone from number +31 20 5813900and left a message (dark mail voice):

'message .. message .. message .. boom .. boom .. message .. message .. boom'

I called back and it asked for to put in the correct extension.

After that .. nothing.

They've called me on my celphone (02/05/2011 at 10:42) from number +31 20 5813900and left a message (dark mail voice):

'message .. message .. message .. boom .. boom .. message .. message .. boom'

I called back and it asked for to put in the correct extension.

After that .. nothing.

It's NIKEiD

To day at 13:51 the phone rang .. From this number .. Nothing in the other end

I recieved a call from +31 20 581 39 00 today. The call came from Essocard regarding my order of a new card. Nothing scary about it...