Currys PC World

On 4/8/17 I ordered on-line a laptop from Currys at Newport. I arrived to collect it on 5/8/2017 and was instruvcted that there was an extra £40 charge for set up. A service I do not need and had not ordered. The salesman stated it was for recovery - later it was to save me time and referred to as USB. I would not pay the £40 and the price was reduced to £20 and being in a rush I paid it. The event has left a nasty taste and instead of having an unopened box have what in my mind a used device. I am being advised to return the device and get all funds returned. I have no real idea on what Currys have done -little I suspect. Very unhappy.