I got this call about 20 mins ago. I answered and was asked 'How are you today' by a stranger. I immediately asked what they were calling about, and they started to reply that it was advice about something or other and they cut the call mid sentence.
I looked up the number online and found a page suggesting it was a trunk call from India. Wasn't aware trunk calls still existed, and this chap had very British sounding voice and the line was excellent so have no idea whether this is true.