Bought a HTE phone and now they don't want to fix

I bought a HTE cellular phone from them around this time last year. The phone died on me this past week. When I tried to get service from the Menlyn branch they told me I can't be helped without a till slip. My phones warranty might run out in the next month or so and my till slip is lying in a box in Ladysmith. I'm in Pretoria writing exams over next 3 weeks Send this is the service I get. For a company to sell you a cellphone and not be able to check an IMEI number to see if the phone is still under warranty is unacceptable in this information age. I would've expected better service from a retailer I frequently used. I just wanted someone to book my phone in if they came back to me and said it is out of warranty I'd pay to have it fixed but they didn't even bother.