Refusal to repair

Two or so months back I signed a contact for an Asus Fonepad 7 with Telkom. I did everything online and the product was delivered to my door. It stopped working last week. I took it to Telkom Clearwater today to indicate that it just wont charge. The kind lady who helped me said I need to produce the delivery note/waybill I got on delivery. I obviously threw that away the day it came. She said they cant help me. The repair centre needs that note otherwise the product wont be repaired. Surely your system knows I'm your customer because you deduct money from my account every month. How is it ow that when your product is faulty I cant get help?