Worst experience ever

Bought a cell phone from Pep cell East Rand Mall Saturday 26/8/17 after 14:00. Very excited for my new phone that I saved up for so long. Went back Saturday 02/09/17 09:00 to return phone. Issues: battery overheats, battery doesn't last a full day, phone reboots self, apps close randomly, clock has no settings, phone freezes, apps take long to open. Was told i cannot return phone or refund, must go for repairs (only 7 days after I bought it cash). By the way, was not informed about the 7 day policy. Sent phone for repairs. Phone replaced with exact model but brand new in box. Collected Thursday 5/10/17 after 13:30. What do u know??? Phone has same issues. Phoned Pep on Friday 06/10/17 just after 09:00 to let them know the phone does the same as other one. Was told it has to go for repairs again. What???????? New phone, one day old, same issues. I even showed them one of the issues. Went to Pep on 7/10/17 10:00 to speak to them. Owner on leave, manager not in yet. Told them i don't mind if they don't refund me, just exchange it for a proper working phone. They refuse. No exchanges, no refunds. I paid R1200 for phone. Two new phones, exact issues, but i cannot get my money back or get a decent phone from them. This is completely unacceptable and disgusting service. i saved weeks on end to buy a new phone. The manager screamed at me over the phone when trying to explain my problem and wouldn't give me a chance to speak. The owner is not available. And Pep head office doesn't answer their phones. Can anyone please help me? How do i get this sorted? How do I take it further? I have never been treated like this in all my life. I am very upset. All i want is a decent phone or if Pep cannot do this, at least my money back. There HAS to be something I can do. They promised me that they would phone me by 10:00 latest on Monday morning 09/10/2017. I still haven't heard from anybody at Pep Cell or Head Office.

**************** OF VERY HARD EARNED MONEY

DISGUSTED AND OUTRAGED