faulty cellphone

On 19th July I bought a Samsung cell phone at Mafikeng Edgars. I paid cash for the item and also used my points card. On the 7th August the cell phone started to malfunction. As I reside in Johannesburg, my receipt as proof of purchase was lost in transit on my way back home, but I had my collection document which indicated the type of cell phone, where it was bought, cost, EMI number. On the 10th August I went to the Cradlestone Edgars to ask for assistance. The three people I asked for help (Naledi, Rachel, Mpho) told me because I didn't have the original till receipt ,I couldn't be helped. After I explained that the receipt was lost and i only had the collection document. Shockingly it showed on their system that I indeed made purchases on that day but for some reason they couldn't print out a receipt. Their response was that I had to go back to Mafikeng to return the cell phone!!!!