Person hung up as soon as I said hello

Someone claiming to be from American Express. I don't have American Express. Probably some punk who got his hands on the data that has been released lately and was going to try and scam some money. Not this little black duck!

Symbio Networks is the owner of phone numbers beginning with the range 02 7201

Persistent harassment. Should be investigated.

I have the same issue, however he's using other number (02) 7201 8396. Its harassment.

I have the same issue here but this scum bag is using another number (02) 7201 8396. Calls basically 2 to 3 times. Lucky i have auto reject on my phone.

Called and didn't go for a full ring

The same to me.

Answered the call and they hung up as soon as I said hello.

Hung up as soon as answered.

Hung up as soon as i answered

Said hello.

Called once. Rang several times and hung up. Seems like they did not wait until the call went to voicemail.

ring 2 times then hung up