No answer when I picked up on my landline - just the bips. Fed up with this caller who has called several times in the past two weeks.
I can't block on my landline but will if it comes on my smartphone.

Caller: Male caller

The caller had an accent (Indian I think) but spoke very good English. He told me that he wanted to talk to me about my internet connection, however I told him that I wasn't interested (didn't have an internet connection) and asked him to take me off his call list, after which he hung up.

Missed call, they didn't leave a message. Didn't ring very long either. Straight up I'd say that's suspicious. It was one of a cluster of three calls from unknown mobile numbers over the following two hours.