About 3 months ago we suddenly started getting phone calls from a number which we have identified via 1471. The caller just hangs up when we answer. It can be two or three times a day at random times including one at 4am. My son in law has called the number and attempted to have a polite " do you realise you're misdialling" conversation but got hung up on. This morning I've had 4 phone calls, at 6.40, 9.47, 11.25 and 11.35. On the 11.35 one, a woman actually spoke and asked for someone by name. I asked if this was the person who kept calling us. She said it was her daughter dialling the wrong number. I told her it had to stop. She hung up. Less then 10 minutes later - we got another one. I work shifts. I want to sleep. How do I make it stop without the expense of new equipment or changing my phone package or the inconvenience of changing my phone number? It's driving me nuts.