They want to share some information but if you say that you are not interested, They keep on trying and then they hang up. Not legitimate number or company. When you try to call back, Number doesn't connect
Trying to validate your contact details so they can sell your information. The love to use a voice VPN solution to mask the incoming call origin. On the upside, They can't sell you info until they have validated it. So give then nothing :-) They will use different fake incoming call origins, But its the same people in India. XDBS or similar
Worryingly they had my work email address which i use for nothing personal. We recently changed our @ address so they have acquired my details very recently.