got my no. while calling another person

I once had a cab wale na baat ki bade achhe se, whatsapp pe kiya but den on instagram hi asked for something else. You tell me it's a wife. How does this happen? And he changed his name. I was confused as to whether the school was a friend or this. I found out by connecting with another school friend. My WhatsApp also doesn't work, WhatsApp used to send mail in support. This SMS called me from LinkedIn. Now tell me, we do not have any demand for the common man. The whole world has become digital, what should we do in this? Particularly enduring lockdown still.