How difficult is it to get a copy of a contract.

Samsung required a copy of a contract /proof of purchase/ownership for a free screen fix. I have been battling for 4 weeks to get any such documents from Vodacom. In the past 4 weeks I have been sent to the branch, then phoned the call centre, had several service requests logged, send fax requests and supp**** information and documentation requested. Yet still no proof of purchase/ownership!!!!! Today I received an sms from Vodacom stating that a warranty document from any Vodacom shop will suffice. I have been battling for 4 weeks without my phone to get proof of purchase from Vodacom and went through all of the calls, faxes, frustration and trouble for nothing? Why could they not advise me of this in the first place. I am so sick of bad service and *********** and unhelpfull call centre staff!!! What do I have to do to get a copy of my contract???