Online bargain hunters say Black Friday is all a con: Digital shoppers claim retailers increased prices while advertising massive sales

    Customers attempting to purchase from Asos website were left bemused
    Shoppers found items they had in basket had gone up in price overnight
    Asos admitted cutting back some of its discounts prior to Black Friday
    It said this was to make way for its '20 per cent off everything' deal
    Which? group warned retailers 'play fair' and 'make special offers special'

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