Weird insurance quote

Several years ago, I phoned an insurance company for a quote for my car. It was about lunchtime and it was the first time I had contacted the company. The salesperson asked for my name and when I gave it she said that she already had all my details on screen, together with the quote. When I asked how could that be she said I had phoned earlier in the day. When I denied this she insisted I had. It turned out that another person with both my name and my exact date of birth (day, month and year) had phoned that morning. The details were his. My wife insists that many people must have the same name and date of birth but I disagree. And obviously it is weird that my namesake and I should both have contacted the company for a quote on the same day.