Has called me multiple times during the day when I've been unable to answer. Has never left a message, however during the 30 seconds of silence in the latest message you can hear a call center in the background. In the background I could hear other people on the phone asking to provide them with bills etc.

Yes there was a long silence before he spoke but I could hear a call centre in the background.

I rang back the number (02) 8066 6983 once but got disconnected

I answered. He wanted to speak to husband who wasn't available. Offered to take message and he hung up.

Caller: ?

called on the weekend. No message and no indication of who it was. No way to return it or leave a message.

I returned a call from (02) 8066 6983 but the voicemail didn't mention the company name