Doors & windows

The salesman was very smooth and seemed to be knowledgable, He assured me that Anglian give a 35 year guarantee,with their doors and windows which covers everything and that on the sale of the house ,the guarantee can be passed on to the next owner. When I checked with Anglian I was told that the guarantee was only 10 years.
The offered price was erroneous, for 3 doors and 2 windows the initial assessment was £4000, but then the salesman sat down with his laptop and came up with a figure of £13000.Then after knocking off a large sum of money for displaying a board outside my house, allowing photos, advertising on facebook, and a couple of other things, the price had come down to £8000.Another discount was added and the price came down to £6000, then £5750 and then £5500. After a sleepless night and some reflection I felt that I couldn't trust anything that I had been told and decided to cancel the contract. My overall feeling is that the product was good but that the salesman couldn't be trusted and it would have been better if I had been given a fair price in the first place.