horrible service

I Marisaa chetty from PMB had purchased an s5 mini from makro in PMB campsdrift .I paid R5500 in cash for the device .Rebecca naidoo the manager had helped me ..within the a few days the device started switching off and freezing so I had taken it back to makro they had sent it for an assessment to which they credited me and had got another s5 mini ...It was fine for a month until the new 1 I had gotten begun to heat up like an oven it goes extremely hot ..as well when the charger is not in the device it magically says charging ..I had taken the phone to makro and explained the situation to which at first I received no help ..I had to wait for 10-15 minutes for assistance to which I had received bad customer service and a don't care attitude ..I was told the phone has to be booked again ..when the phone had returned bk according to cel c which are unqualified people the phone doesn't heat in spec ..I'm an IT tech so I know these things ..I was given the same ******* phone back which still heats up and charges when there's no charger even plugged ..my boss had taken the phone to makro ..which makro now said once again book it in for a month! I just want my money back !!!