Barnardo's Furniture in Hull

Barnardos Hessle Road, Hull; today (spent well over £130 there in the last 8 months). Wanting to browse the book shelf but knowing if I get down on the floor for the lower shelves I can get up again, so I turned a dining chair 45 degrees to sit on it as i browsed. Picked 5 books, still browsing when short, blond "manager" came over, tapped me on the shoulder and told me she needed to take the chair. I stood up, yes of course! thinking she had sold it and someone had come to pick it up.
She took the chair to the other side of the table and removed the price tag from its identical sister chair and put it on the chair I had been using. I said "why did you do that?" She replied "people cant buy it if you are sitting on it can they?" Only me and my friend and one other person in the shop.
Rude beyond belief. Customer Service Hell. Needless to say, I didn't buy any books or even look at the rest they had for sale.