ZERO SERVICE FROM SAMSUNG

My Samsung S4 needed a screen replacement - policy states 2 free replacements in warranty. I had 1 remaining. I took the phone to Samsung service centre at N12 Terminal office block in Boksburg on the 19th May. The agent took my IMEI number and checked that it was still in warranty, he said that it only expires in August 2015 and that I should contact Samsung customer service to enquire where the nearest service centre would be that does \IN WARRANTY"repairs as they only do \""OUT OF WARRANTY\"" repairs. I did just that and the call centre referred me to SSS Cellular in N12 Industrial Park. I went there the next day 20th May and they booked my phone in (service order sheet marked as \""IN WARRANTY\"". Because I had won the phone in a 94.7 Highveld competition I could not provide a proof of payment. I was told to call *** and spoke to Lebogang. She kept casually calling me \""Stace\"" and told me my phone was NOT in warranty. She quoted the 20th May as expiring which was the SAME day as calling. I asked to speak to her manager and was told Louise Jansen van Rensburg would contact me"