There have been reports from multiple residents of the area about receiving phone calls from someone claiming to be a health worker saying they have been informed that the person called is elderly and has a health condition.

They then offer a ‘free’ health alarm device. If you receive such a call the advice is to hang up and definitely not to give credit card or bank details.

See link below for full information and advice.
Surge in cold calls targeting older people offering free personal alarms