PEP store DSTV Explorer

Good day My experience at Pep was rather unpleasant and not necessary, December the 25th 2021 we got a DSTV explorer as a gift and in January 2022 we installed it and a few days later it stopped working and the installar adviced to take it back, so we then went to Pep in menlyn mall and when we got there we explained that we don't want cash but an exchange but the cashier was rather rude and asked us where we bought it and didn't even take a look at the slip.then the manager came by the name of Noni and said we cant exchange it cos it was bought on special in December 2021 so they can only refund us or we should add on cos it's now a thousand rands. Then we saw the display saying it's R849 ,still they refused to help us. We just wanted an exchange not a refund,is this how your customers are treated, and aren't this pep stores the same thing? And they were adamant that they won't exchange for us, So we'd rather walk with our money and lose a sale and a customer. Very disappointed