I missed the call (no message left) but I called it straight back and got an american (sounding) automated voice saying the number is unreachable. Sounds like spam to me!!

Chinese Visa scam

Left a voice mail in mandarin?
Upon calling back phone rang once then disconnected.
recommended blocking them

Agreed. Something in chinese.

Sounded like Chinese.
I think with music in the background

I didn't answer. Voicemail was left, sounded automated. A Chinese language with hold music playing.

An automated Mandarin-speaking voice. Don't bother answering

Fake DHL

It looks like it's a spam type call with a recorded message of a lady speaking in Mandarin if I'm not wrong.

third different number speaking chinese

Speaks in another language. Have received 3 of these calls today from 3 different numbers

DHL chinese scam

I called back the number 0480 048 893 but the call didn't go through