See who's calling

Man called to tell me that the warranty on my boiler had expired. Seemed to know we had it in 2007. I asked him why he was telling me this and said it was rather a strange thing to tell me out of the blue. Think that flustered him as he didn't try and sell me anything but just told me there was no need to be rude. I repeated that it was a strange thing to phone about and hung up.