I called back number (07) 9586 4250 rang 3 times then goes to busy tone.

They have called me several times over the last couple of weeks but the phone rings only a few times before they stop. Today I answered in time, but they hung up. Cannot call the number back. I've now blocked it but now getting calls from a different number!

They’re a pain in the bum. Call and don’t answer when you ring back. Grrrrr!

i have had 6 calls over the last week each time I answer they hang up

They phoned, answered. They hung up without talking.