Came up as “Kalkallo”. I don’t know anyone from there, so picked up the call but said nothing. They said nothing too, then hung up.

I picked up, said hello and "click" the other end hung up.

Caller: Telemarketing Company

Have received calls from this number and (03) 8103 7316 usually let these ring out. Today I rang back and got a prerecorded message stating they "Offer Assurance" offering deals for internet connections etc.
Have now blocked their numbers.

I answered but they hung up.

blocked the number

They call regarding gas or energy account.. actually dont know.. it’s suspicious

They rang, auto call stop after a few rings, no message left

Caller: Energy Service

Returned call and call centre for Energy Services

Nuisance Caller

Caller: Oak Road

Oak Road flogging wine

gas and electric cold call

The call rang and hung up before I could answer. A call back rang for a while and then got an automated 'Good-bye' before a hangup.