I rang back it said that it was Bigpond and that the number had changed

i answered and they hung up

I keep getting calls from this number. No one answers when called back

Sounded like an overseas call with a female with an amercian accent, but perhaps could have been asian.
They asked for someone nelse who has a different name.
I rang back and the line was not connected.

I called back number (02) 1312 8254 rang 3 times then goes to busy tone.