No message left and engaged constantly when tried to call back

Missed call on my mobile; no voicemail left. I called it back (from a private landline) and got a busy tone. My spidey senses say it's spam.

Victorian Government encentive to upgrade hot water, LED lights as well as the fans...
I almost felt like I had the old demtel add offering but wait there is more.....

Missed call from this number. Called back, phone was busy.

No one there engaged all the time

scam number - trying to see if your number is active

Rings, doesn't say anything, hangs up

Multiple calls and they never leave a message. Blocked.

Continual calls on a Saturday. No message. Constantly engaged when I tried calling back

Unknown caller