Pep is a ****

I am so disappointed at people I think they are used to taking advantage of customers.i bhought dstv decoder at pep.when I got home my husband already bought another one. I returned it back to the store in verina mpumalanga they refused to pay me the full amount they said the remaining amount was for installation. How can I pay for installation because the dish was not installed. They refused to give me my money back they refunded R500 only.