Called but didn't leave a message. Didn't accept return calls. Suspected scammer

didn't leave a message and didn't actually say anything when answered

Left a blank short message but with no audio. Keep getting calls from this number at the moment.
Called back, and it rang several times then I got this message:
"Due to temporary service difficulties we are unable to connect your call at this time, please try again later"<!>

I think probs best avoided.

Didn't leave a message. Called back later and it just rang forever.

Called, didn't leave a voicemail.

Caller: Sydney Ph call from Aust Mines from the above #

Said he was from Aust. Mines asked for a similar name to my friends said I did not know them. Thanked me for taking call. I hung up

Called on the VOIP and asked if it was me (gave my proper name) and then pretended he can hear me. the call then disconnected. He then called on my mobile with the same outcome. I tried to call back, but no answer.