Now you've given us the names of the organisation in full, rather than just an acronym, I've been able to google it (but, importantly, adding 'UK' onto the end of the search). It seems that there is such an organisation that helps the elderly but
(a) it's actually a commercial home care company ;
(b) it doesn't hand out cash ; and
(c) it only operates in North Wales
https://guardianangelservices.co.uk
Apart from that company though, I can find nothing that matches the name you've given. The complete absence of a website, or even of a reference to the organisation on any other website, makes me even more certain that it's some sort of scam.