Sounds very much like Kirby cleaners. Don't believe them.
Our next door neighbour practiced on us once. Yes, at least 2 hours talk and they clean a patch of the carpet, a square by the door or something, just to show you how it works. If you want the rest of the carpet done you have to do it yourself, and will probably buy one of their cleaners !
Don't let the buggers in.
Feel sorry for the kids that take these jobs on, but when interviewed they are not told much about the job or even which company it is for. Based in Birkenhead.
Humankind has not woven the web of life. We are but one thread within it. Whatever we do to the web, we do to ourselves. All things are bound together. All things connect.