On answer it sounded like an overseas female caller asking me how I was today. She admitted she didn't even know my name so I terminated the call.

suspected spam

Caller: Female on a very bad line

Incoming call was a very bad line but I did hear the woman say something about wine sales (I think) before the line cut out completely.

Missed call, on returning the call a recording said the number was unavailable.

Called me several times last week as well, but to now has never bothered to leave a VM.