Vodashop westwood misleading

I bought a Samsung tablet from vodacom shop in westwood mall on the 31st Jan 21 onth 2nd Feb I returned it to the store they checked the device and they said it is faulty its giving black screen and white lines and they have to book it in for repair and it will take from 2 to 14 working days I asked them for a refund they refused because have to wait until they get the report if it's physical damage or not on the 20th Feb they phoned me to say the divorce repaired and I can take it, I asked them for a refund they said won't refund because it was software and some vodacom activation, the device gave me fault from the second day this is not value for money, I will do what ever it takes to get my money back from this shop the management of shop very arrogant and misleading.