I kept getting a call from this number (ends in 565) starting a few days ago. Thought it was from the states so I rang it back and got some lady with an funny accent saying 'hello, hello', not sure where she was from. After she couldn't hear me I hung up. Checked my call credit and a whopping $11HK was used for a less than 10 second call. I'm in Hong Kong by the way. This number keeps ringing me every now and again still. Anyone know how to block it?