I have had 5 calls in the last 3 days from the same number. Everytime I answer they hang up, even if I answer really quickly. Yesterday I rang them back and got an answerphone stating "hank you for calling ...., we will put you through to a sales advisor" (cue me hanging up) AIBU to think that this is cold calling at its worse, not only do they annoy you and wake your DC's up but now they want you go pay for the phonecall as well?