Waitig for proof of purchase

I have a Samsung s4 mini that I received from Autopage in January 2015 as an upgrade on my contract for cell phone number ***. The phone is giving trouble and I took it to Vodacom to be repaired on 20/6/15. Vodacom workshop said that the serial number does not show under warrentee and they wanted to charge me for the repair. I was told to give them proof of purchase from Autopage, then they will repair it under warrentee. I phoned Autopage customer support on Thursday to get the proof of purchase emailed to me. Got promises but no proof of purchase. Friday I phoned again and just more promises. I also logged a request online to Autopage and still I do not have my proof of purchase. The repair of the phone is urgent to me. I need it for work, but I just get no response from Autopage. Please note that I am using the number below and *** is not active now.