Me too I'm in Melbourne, Australia. I got a call from this number +248-268-1995 today 4 hours ago and last Wednesday I got a call from +248 2654260. It says Seychelles...
Just did a bit more research - apparently the number is a 'premium number' that charges the caller a high amount for dialling it. They let it ring once or twice before hanging up - making sure you miss it. When you call them back they will charge excessively for the call - and they get a cut of the charges. Just block the number...!