Caller: Telemarketer for "Energy Service Provider"

Answered the call and had 5 seconds of dead air before the telemarketer's auto dialler dropped out.
Caller in a thick Indian accent said his name was 'Daniel' and asked me to confirm that he was talking to the person authorised to change the Energy Service Provider for this address.
I said he wasn't and when he asked to speak to the person who was authorised to make changes, I told him we were not going to deal with spamming telemarketers who cold call us.
The call was instantly disconnected.