My mums memory is going and she has started to trust complete strangers. I have told her not to answer the phone to strangers especially when they ask her to press numbers on her phone , which gives them access to her phone line. She also recently had a gardener ring her , a complete stranger. He agreed to come cut her lawns and tidy her small garden for thousands of pounds, she had agreed to go get cash for him before he did it. Luckily I managed to stop her. She didn't know his name or his telephone number or his business name. She said she didn't know that she needed all that information. I explained that she should have got a written quote first and that reputable firms do not ask for cash upfront. She didn't seem to realise that this was a scam. How do I stop her falling for these conman