Missed call on my mobile. I called back from a private number landline and the guy reckoned he had been returning a missed call from me, which is absolutely not true, no sign of an outgoing call on my mobile. He only said the first 4 digits of my number though, so if it was malicious, it feels like he could have used a bot to cycle through a bunch? He had an overseas accent, but didn't try to sell me anything, but also didn't identify himself (and neither did I). Very odd interaction. Doesn't seem to be any unusual charges in my landline account from calling him.