Takealot Wrong Price Billing

Takealot.com overbilled me for the purchase of a Tecno Spark 5G dual sim cellphone which had the displayed price of R3398.00 but I inadvertently did not check the price on the checkout order form which was now R3998.00.The consultants I emailed gave me one lame excuse after another and said that Grow More Africa is the third-party seller and there's nothing they can do to give me a refund of R600.00 which I was overbilled for.