Cold call got cold shoulder

I got a cold call from weatherseal who implied that they were checking the warranty on my windows. They would come round check the seals and leave. They were not trying to sell anything. The guy arrived did not give mW any ID. He checked the windows waffle walks waffle. 5 mins it took. Told me they were not good they were pikington glass and said they needed servicing and it would cost a lot. Liar. Them he came downstairs sat down I remained standing should have given him a clue. He promptly opened his case and said it will cost £1500 to sort them out. No measuring no checking of the windows. Didn't include the porch. He said I could pay there and then and was shocked when I said I would think about it. I will ring you. No card or brochure left. To add insult to injury he promptly lectured me on who I was related to. Google it and you will see I am right. But the surname is spelt differently. I gave him the name of my cousin an England football player. His reply no you are wrong. I will not have them to check my windows a local builder is doing it. I have also blocked them on the phone.