annoying marketer from energy company trying to con you out of your gas supplier if you have one

Spam. Trying to sell Gas connection..when I ring the number back it says it's a disconnected/invalid number

Caller: some energy company

definitely a scam. Saying about my outstanding bill when I do not have one and that they are offering discounts and all

Caller: unknown melbourne number

received call on my mobile which I didnt answer then called back from a landline and messge "the number you have dialed is not in service"

spam

Has called several times on similar numbers (after I blocked each). No idea who it is - after the delay on answering I hung up.