I get calls on a daily basis from this number and of a similar nature - blocked all of them

Caller: I don’t know

I said hello multiple times they said nothing and hung up

called but didn't leave a message

Left no message but have had "missed calls" from landline numbers with numbers very close to this one. Blocking it.

Caller: Don’t know

As above, didn’t come up on this site & left no message

Caller: Unknown

Answered the call, sounded like a call centre almost robotic voice. Hung up on them. Did not call back.

Caller: Solar panel company

Unclear company name, asking information as to whether I had solar panels and ended the conversation when I stated I was not the home owner

Left no message & didn't come up on this site