Poor customer service

I bought earphones at PEP cell kuilsriver 20 April when I open the box at home find out one side if faulty so I went back to them today ask for exchange lost my slip bought on my account we phone customer service they can see the amount

and the date still they refused want slip ask them to do reprint since I buy to them they can't course system don't allow them . I ask them to call the Area Manager they say she/ H e(RUCHELLE) in the meeting customer service advise me . I speak with Shaan-legh/Amanda sales lady they say they need the slip I need area Manager to resolve this call me I left my number at the store.