I called back number (03) 7019 6864 rang once then gets disconnected automatically.

Called and when I answered they hung up. Probably just checking for phone numbers that answer, then put them on the call back list. Blocked.

Same as others have commented received one ring, hung up upon me answering.

When i answer it just hangs up straight away. I have blocked the number now as this has happened a few times to me. Suspect a spam call

SPAM. Answered the call, a few seconds of silence then they hung up. SPAM.

Hung up when I answered

Rang back after hours to hear a robot asking me to record a message???
No "you have called" message so I take it it's not a person or a business.

When I answered the phone no-one spoke. I just hung up and blocked the number.

All spam calls I receive are from (03) numbers and they seem to come in waves - a new wave has just started. I'll block one number and I'll get a call from another (03) number. This was the same as all the others - no message left and I will not ring back. Have blocked the number but 100% guaranteed I'll get another call from a different (03) number tomorrow.

Asked for me by name. Had a foreign accent, maybe African. Called back but it went to answerphone with a recorded message with an american accent.