A similar one is where you receive telephone call and are told you are about to be cut off due to an unpaid bill. pay £30 now or £118 if you delay and have to be reconnected. Just another scam. They try to prove to you that this is no scam by suggesting you try to make a call. You won't be able to because the person who originally phoned you has not hung up, then after a while they will then hang up and immediately ring you back claiming they are legitimate. Don't get caught.