What a load of tosh, he is trying to get out of replacing the carpet. In the first instance the supplier should deal with the problem but he isn't so ask the supplier for the manufacturers name and telephone number as you want to get in touch with them for an inspection from one of their reps. Most quality carpets come with a 5/8 year guarantee. Usually in these circumstances the manufacturer will send out a rep to inspect the carpet. If you get no joy there get the trading standards in and ask them to deal with it. Your carpet is not fit for purpose so should be replaced or you should have a refund. It would be very interesting to see what Mr Dyson had to say on this subject. I have a Dyson All Floors and have had no problem.