Bad client service and stupid processes that work against the customer

Less than a year ago I bought i gas heater from Pick ‘n Pay in Westgate shopping centre. The heater is faulty now and I cant exchange or be refunded because of a stupid process. Why must I be inconvenienced and be without a heater for the next three weeks right in the middle of winter. By the time the heater comes back winter will be almost over and I don’t even trust the brand anymore so I don’t even want the heater back, the heater could come back and still be faulty again and I’m not willing to do the back and forth I don’t have the time, I just want to be refunded so that I can go buy a new heater elsewhere and stop shopping at Pick ‘n Pay all together because the service is bad it does not matter which one you go to.