Guessing this is a scam / telemarketing call, as they have tried 2 - 3 times a day for the last week. I let them go to message bank, but (as expected) no message left.
Just block the number.

Caller: Some mob that said I had an appointment with them???? Real estate

Woman eventually answered the call, waffled about needing my number to find out who had called me. Flustered & asked to ring back in 30secs. Guess what? No appearance your worship!

I called back number (02) 8004 0188 was put on hold music but no one answered the call.