Bad service

Went to sheet street for reduced to clear sale and got a bath set mat with the sale sticker on. Went to pay for items and cashier said the bath mat set wasn't part of sale and took it from me.i asked for manager but they didn't come. I called call centre to explain the situation and call centre agent said the item wasn't on sale but I explained that I saw it with a sale tag.call centre agent said she will call area manager first and get back to me but nothing yet.Consumer right say that I buy as presented in t