Bad Service

Idont know what must I do now I m using a Samsung s4 and it has a screen warranty repair and now its been almost two months since i've requested at Vodacom a proof of upgrade so that I can get my phone fixed by ADH agents in Borksburg SSS Cellular now since then Vodacom failing to provide me with a proof of upgrade and now im paying for a phone that I don't even have cause Vodacom cant provide me with my own Copy of Proof of Purchase so how do I deal with such issue cause my Contract is expiring in a Months time and from then I wont be able to fix my phone with the warranty.