Even though I am pretty privacy conscious the community that I live in has decided to get off WhatsApp, I did have my number associated with my account for the reasons of local communication. So yeah you are right that this was my fault to an extent.
Questions have mostly been similar to what you mentioned, although often said in ways to try to evoke answers that could prove their unfounded suspicions of some sort, but it was the temporary retention of my passport and been taken to a separate room that got tedious, especially when I was trying to make a connecting flight.